What is MacOS? Everything You Need to Know (2023)

By Tibor Moes / Updated: June 2023

What is MacOS? Everything You Need to Know (2023)

What is MacOS?

Welcome to the fascinating world of macOS, Apple’s operating system that powers millions of Mac computers worldwide. From its inception as NeXTSTEP to the latest release, this powerful operating system has come a long way, offering users incredible features and a seamless integration with other Apple devices. Let’s dive in and explore the history, features, and evolution of what is macOS!


  • MacOS is the computer operating system by Apple. It allows users to interact with their MacBooks, iMacs, MacMinis and more.

  • It is designed to be easy-to-use and highly secure, offering strong integration with Apple hardware, and reliable software updates.
  • With a market share of around 15%, it is the second most used computer operating system in the world, after Microsoft Windows.

Don’t become a victim of cybercrime. Protect your devices with the best antivirus software and your privacy with the best VPN service.

Understanding macOS

MacOS, which took over from the classic Mac OS in 2001, has seen significant growth over the years and has become one of the most popular mac operating systems. But where did it all begin? Steve Jobs had left Apple and was working on NeXTSTEP, a Unix-based system, which Apple eventually bought and used as the foundation for macOS. The first desktop version, Mac OS X 10.0, was released on March 24, 2001. Today, macOS is at the heart of Apple’s ecosystem, with iOS, watchOS, and tvOS all based on its core.

Transitioning from the previous operating system, the classic Mac OS, Mac OS X introduced pre-emptive multitasking and memory protection, making it a more reliable and stable platform than its predecessor. The heart of the latest version of macOS is a POSIX-compliant operating system built on top of the XNU kernel. With each new release, macOS brings innovative features, better performance, and increased compatibility with Apple’s hardware and software ecosystem.

Evolution of macOS

Throughout its existence, Apple’s operating system, macOS, has seen multiple major releases, each bringing new features and innovations to the table. From the sleek Aqua interface to the powerful XNU kernel and the open-source Darwin operating system, macOS has consistently pushed the boundaries of what an operating system can do.

Let’s take a closer look at the evolution of macOS, from version 10.0 (Cheetah) to the latest version 14 (Sonoma).

Version 10.0: “Cheetah”

Cheetah, the first version of Mac OS X, was released on March 24, 2001. As the foundation of the macOS we know today, Cheetah introduced the world to the sleek and eye-catching Aqua interface, which received mixed reviews due to its slow performance.

Nevertheless, when Apple released Cheetah, it marked the beginning of a new era for Apple and its operating systems.

Version 10.1: “Puma”

Puma, the successor to Cheetah, was released on September 25, 2001, and brought with it simplified CD and DVD burning, new Finder features, and expanded printer support.

As a free upgrade for 10.0 users, Puma addressed many performance issues and set the stage for future macOS improvements.

Version 10.2: “Jaguar”

Jaguar, the third major release of Mac OS X, hit the stage on August 23, 2002. This version brought significant improvements, such as a sleeker look, over 150 user-interface enhancements, Quartz Extreme, Address Book, and iChat, as well as raw performance boosts.

Jaguar continued the trend of refining and building upon the foundations laid by its predecessors.

Version 10.3: “Panther”

Released on October 24, 2003, Panther, the fourth major release of Mac OS X, came packed with new features and enhancements. With an improved Finder, Fast user switching, Exposé (Window manager), FileVault, Safari, and iChat AV, Panther provided users with a more robust and seamless experience.

This release signalled the end of support for certain G3 models, including the “Beige” Power Macs and “WallStreet” PowerBooks.These computers were among the earliest G3 machines made.

Version 10.4: “Tiger”

Tiger, the fifth major release of Mac OS X, was released on April 29, 2005, and brought with it groundbreaking features like Spotlight search, Automator, VoiceOver, and more than 200 other enhancements.

Tiger’s innovations in search and automation continued to push the boundaries of what an operating system could offer its users.

Version 10.5: “Leopard”

Leopard, released in 2007, was the sixth major release of Mac OS X and introduced a host of new features and improvements. With a sleek Dock, spruced-up menu bar, Stacks, Time Machine, and Spotlight improvements, Leopard offered Mac users a modern and refined operating system experience.

It also required a G4 processor with a minimum clock rate of 867 MHz and at least 512 MB of RAM installed for compatibility.

Version 10.6: “Snow Leopard”

Snow Leopard, released in 2009, was the first version of macOS specifically designed for Intel-based Macs. This release focused on expanding 64-bit architecture and brought improvements to VoiceOver, trackpad gestures for the vision impaired, and support for Braille displays.

Snow Leopard continued the trend of refining macOS and laying the groundwork for future innovations.

Version 10.7: “Lion”

Lion, the seventh major release of macOS, roared onto the scene in 2011. With a host of new features, such as Launchpad, multi-touch gestures, and a revamped Mail app, Lion provided a fresh and modern experience for Mac users.

Lion also introduced the Mac App Store, which made it easier than ever to discover and install new software on your Mac.

Version 10.8: “Mountain Lion”

Mountain Lion, released in 2012, brought tighter integration with iOS devices and iCloud, as well as new features like Notifications, AirPlay Mirroring, Gatekeeper, and Game Center.

With the addition of Notes, Reminders, and Messages, Mountain Lion further bridged the gap between macOS and iOS, making it easier for users to switch between devices and stay connected.

Version 10.9: “Mavericks”

Mavericks, the ninth major release of macOS, debuted in 2013 with a focus on improving the efficiency and performance of the operating system. With the addition of Maps, iBooks, and Tags, as well as upgrades to Notification Center and improved privacy features like password encryption and storage, Mavericks continued the trend of refining and expanding the capabilities of macOS.

Mavericks introduced a range of new features, such as improved battery life, faster wake from sleep, and improved support for multiple displays. It also included a number of new apps, including Calendar, Contacts, and Remedies.

Version 10.10: “Yosemite”

Yosemite, released in 2014, brought a fresh new look to macOS with its flat design and vibrant colors. This release also introduced Handoff and Continuity, allowing users to seamlessly switch between their Mac and iOS devices, as well as answer phone calls and send SMS messages from their Macs.

Yosemite was a major milestone in the evolution of macOS, emphasizing the growing synergy between Apple’s desktop and mobile platforms.

Version 10.11: “El Capitan”

El Capitan, released in 2015, focused on stability and performance improvements, with enhancements to graphical user interfaces and expanded Microsoft Windows interoperability. This release also introduced new features such as Split View, an updated Notes app, and improvements to Safari and Maps.

El Capitan refined and refined the macOS experience, setting the stage for future innovations.

Version 10.12: “Sierra”

Sierra, released in 2016, brought Siri integration to the Mac, as well as features like auto unlocking with Apple Watch and a smarter Photos app. With the addition of Optimized Storage and updates to Photos, Messages, and iTunes, Sierra continued to refine and expand macOS, making it more powerful and user-friendly than ever before.

Version 10.13: “High Sierra”

High Sierra, released in 2017, marked a major change in macOS with the switch to the Apple File System (APFS). This release also brought enhancements to Safari, Mail, and Photos, as well as improvements to privacy and security features.

High Sierra represented a significant step forward in the evolution of macOS, paving the way for future advancements in both performance and stability.

Version 10.14: “Mojave”

Mojave, released in 2018, introduced a system-wide dark mode, along with new apps lifted from iOS, such as Apple News, Stocks, and Home. Mojave also brought improvements to the Finder, as well as the addition of Stacks for better desktop organization.

This release continued the trend of refining and expanding macOS, offering users an even more polished and feature-packed experience.

Version 10.15: “Catalina”

Catalina, released in 2019, brought significant changes to macOS, including the breakup of iTunes into separate apps for Music, Podcasts, and TV, as well as the introduction of the Catalyst system for porting iOS apps to macOS.

Additionally, Catalina introduced the ability to use an iPad as an external monitor, further enhancing the integration between macOS and iOS devices.

Version 11: “Big Sur”

Big Sur, released in 2020, marked the beginning of a new era for macOS, with a completely redesigned interface, improved performance, and enhanced security features. This release also introduced support for Apple Silicon Macs, offering improved battery life and compatibility with the latest hardware.

Big. Sur set the stage for a new generation of macOS, pushing the boundaries of what a modern operating system can achieve.

Version 12: “Monterey”

Monterey, the latest version of macOS, brings a wealth of new features and enhancements to the Mac, including Shortcuts, Universal Control, a revamped Safari with tab groups, and improvements to FaceTime. These updates make the Mac Mini experience even more enjoyable for users.

As the newest member of the macOS family, Monterey continues the tradition of innovation and refinement, offering users a powerful and cohesive operating system experience.

Naming Conventions and Themes

The naming conventions of macOS versions have evolved over time, starting with big cats such as Cheetah, Puma, and Jaguar, and later transitioning to famous California locations like Mavericks, Yosemite, and Big Sur. These names not only reflect the unique features and characteristics of each macOS release, but also pay homage to the rich history and culture of the region where Apple was founded. As we look back at earlier versions, we can see how far macOS has come in terms of innovation and user experience.

The names of macOS versions have become more than just a way to differentiate between releases. They are a way to honor the history and culture of the region where Apple was founded, and to celebrate the unique features and characteristics of each macOS release.

Key Features and Innovations

MacOS has consistently introduced groundbreaking features and innovations throughout its history, such as the beautiful Aqua user interface, the powerful XNU kernel, and the versatile Cocoa and Carbon APIs. With each new release, macOS has pushed the boundaries of what an operating system can do, offering users an ever-evolving and feature-rich experience.

The macOS ecosystem is also tightly integrated with other Apple products and services, allowing users to switch seamlessly between devices and stay connected across the Apple ecosystem. Features like Handoff, syncing, and Continuity make it easy for macOS users to work and play across their Mac, iPhone, and iPad devices, providing a consistent and enjoyable experience no matter which device they’re using.

macOS and Apple Devices

While macOS is supported on Apple’s desktop and laptop computers, not all devices are compatible with the latest version. As Apple continues to innovate and release new hardware and software, older devices may be left behind and unable to run the latest macOS releases.

Additionally, “Hackintoshes” – non-Apple computers running macOS – are not officially supported by Apple and may not receive updates or technical support, further emphasizing the importance of using genuine Apple hardware to ensure the best macOS experience.

Transition to ARM Architecture

The history of macOS has seen significant transitions in processor architecture, starting with the move from PowerPC to Intel processors in 2005, and more recently, the transition to ARM architecture with the introduction of Apple Silicon Macs. During these transitions, Apple has employed various strategies to ensure a smooth experience for users and developers, such as binary translation layers and the creation of Universal 2 binaries that support both Intel and Apple Silicon architectures.

The transition to ARM architecture brings numerous benefits to macOS users, including improved performance, better battery life, and the ability to run iOS and iPadOS apps natively on Macs with Apple Silicon processors. This move further solidifies the integration between Apple’s desktop and mobile platforms, providing users with a seamless and unified experience across all their Apple devices.

Updating Your macOS

Keeping your macOS up-to-date is essential for ensuring the best performance, security, and compatibility with the latest hardware and software. Users can update their macOS through System Preferences. The Software Update settings pane provides this feature. Additionally, they can do the same by running the softwareupdate command-line utility.

Regularly updating your macOS ensures that you have the latest features, enhancements, and security patches, providing you with the best possible experience on your Mac.

Security and Privacy in macOS

MacOS is known for its robust security and privacy features, such as FileVault, Automator, Dashboard, Front Row, Sync Services, and Notification Center. These features help protect your data and privacy, while also providing a seamless and enjoyable user experience.

With ongoing updates and enhancements, macOS continues to be a secure and reliable operating system for users around the world.

macOS Ecosystem and Integration

The macOS ecosystem is deeply integrated with other Apple products and services, providing users with a seamless experience across all their Apple devices. Features like iCloud Keychain, Maps, iBooks, Tags, Handoff, Continuity, and Shortcuts make it easy to sync and access data, switch between devices, and automate tasks, all within the macOS environment. Additionally, the Apple menu offers quick access to essential system functions and settings.

As the macOS ecosystem continues to evolve, users can expect even greater integration and synergy between their Mac and other Apple devices.


From its humble beginnings as NeXTSTEP to the powerful and feature-rich operating system it is today, macOS has come a long way. With each new release, macOS has pushed the boundaries of what an operating system can do, offering users an ever-evolving and innovative experience. As Apple continues to innovate, we can expect even more groundbreaking features and seamless integration between macOS and other Apple devices in the future. The world of macOS is an exciting one, and we can’t wait to see what lies ahead!

How to stay safe online:

  • Practice Strong Password Hygiene: Use a unique and complex password for each account. A password manager can help generate and store them. In addition, enable two-factor authentication (2FA) whenever available.
  • Invest in Your Safety: Buying the best antivirus for Windows 11 is key for your online security. A high-quality antivirus like Norton, McAfee, or Bitdefender will safeguard your PC from various online threats, including malware, ransomware, and spyware.
  • Be Wary of Phishing Attempts: Be cautious when receiving suspicious communications that ask for personal information. Legitimate businesses will never ask for sensitive details via email or text. Before clicking on any links, ensure the sender's authenticity.
  • Stay Informed. We cover a wide range of cybersecurity topics on our blog. And there are several credible sources offering threat reports and recommendations, such as NIST, CISA, FBI, ENISA, Symantec, Verizon, Cisco, Crowdstrike, and many more.

Happy surfing!

Frequently Asked Questions

Below are the most frequently asked questions.

What is macOS used for?

MacOS is a powerful operating system used by millions of Mac users around the world. It is designed to be easy-to-use and highly secure, offering unique features such as intuitive user interface design, strong integration with Apple hardware, and reliable software updates.

What does macOS stand for?

MacOS stands for “Macintosh Operating System,” the graphical operating system developed and marketed by Apple Inc. since 1984 to run on Mac computers. MacOS is the modern iteration of the original OS that was introduced in 1984 for the Macintosh 128K.

What is difference between macOS and iOS?

The main difference between macOS and iOS is that macOS is a computer operating system used mainly on Mac computers, while iOS is an operating system for Apple mobile devices such as iPhones and iPads. MacOS is designed to give users the most comprehensive computing experience possible, while iOS focuses more on mobility and touch interaction.

Author: Tibor Moes

Author: Tibor Moes

Founder & Chief Editor at SoftwareLab

Tibor is a Dutch engineer and entrepreneur. He has tested security software since 2014.

Over the years, he has tested most of the best antivirus software for Windows, Mac, Android, and iOS, as well as many VPN providers.

He uses Norton to protect his devices, CyberGhost for his privacy, and Dashlane for his passwords.

This website is hosted on a Digital Ocean server via Cloudways and is built with DIVI on WordPress.

You can find him on LinkedIn or contact him here.

Security Software

Best Antivirus for Windows 11
Best Antivirus for Mac
Best Antivirus for Android
Best Antivirus for iOS
Best VPN for Windows 11

Cyber Technology Articles

Active Directory (AD)
Android Examples
Android Types
Authentication Types
Biometrics Types
Bot Types
Cache Types
CAPTCHA Examples
Cloud Computing
Cloud Computing Examples
Cloud Computing Types
Compliance Examples
Computer Cookies
Confidentiality Examples
CPU Examples
CPU Types
Cryptocurrency Examples
Cryptocurrency Types
Dark Web
Data Breach
Data Broker
Data Center
Data Center Types
Data Integrity
Data Mining
Data Mining Examples
Data Mining Types
Dedicated Server
Digital Certificate
Digital Footprint
Digital Footprint Examples
Digital Rights Management (DRM)
Digital Signature
Digital Signature Examples
Digital Signature Types
Endpoint Devices
Ethical Hacking
Ethical Hacking Types
Facial Recognition
Fastest Web Browser
General Data Protection Regulation
GPU Examples
GPU Types
Hard Disk Drive (HDD) Storage
Hardware Examples
Hardware Types
Hashing Examples
Hashing Types
HDMI Types
Hosting Types
Incognito Mode
Information Assurance
Internet Cookies
Internet Etiquette
Internet of Things (IoT)
Internet of Things (IoT) Examples
Internet of Things (IoT) Types
iOS Examples
iOS Types
IP Address
IP Address Examples
IP Address Types
LAN Types
Linux Examples
Linux Types
Local Area Network (LAN)
Local Area Network (LAN) Examples
Machine Learning
Machine Learning Examples
Machine Learnings Types
MacOS Examples
MacOS Types
Modem Types
Netiquette Examples
Network Topology
Network Topology Examples
Network Topology Types
Operating System
Operating System Examples
Operating System Types
Password Types
Personal Identifiable Information (PII)
Personal Identifiable Info Examples
Port Forwarding
Private Browsing Mode
Proxy Server
Proxy Server Examples
QR Code Examples
QR Code Types
Quantum Computing
Quick Response (QR) Code
RAM Examples
RAM Types
Random Access Memory (RAM)
Router Examples
Router Types
SD Wan
Server Examples
Server Types
Shareware Examples
Shodan Search Engine
Software Examples
Software Types
Solid State Drive (SSD) Storage
Static vs Dynamic IP Address
Tor Browser
URL Examples
URL Types
USB Types
Virtual Private Server (VPS)
Web Browser
Web Browser Examples
Web Browser Types
Web Scraping
Website Examples
Website Types
WEP vs WPA vs WPA2
What Can Someone Do with Your IP
Wi-Fi Types
Windows Examples
Windows Types