macOS
Also known as: Mac OS X, OS X, Mac operating system
macOS is the operating system Apple makes for its Mac desktop and laptop computers.
Built on a Unix foundation, it's known for a polished design, strong built-in security, and tight integration with iPhones, iPads, and Apple Watches through features such as AirDrop, iCloud, and Handoff. Apple releases a major version each year for free. While macOS is generally secure and easy to use, Macs aren't immune to malware, and some business and gaming software is Windows-only.
macOS, explained at three levels
At home
macOS is the 'personality' of a Mac, like the layout and rules of a house. It decides how everything looks, works, and connects with your other Apple devices.
At work
Macs are popular with creative teams and developers, and macOS can be managed securely with the right tools.
At home
Check System Settings for updates, and turn on FileVault encryption and automatic updates. Features like Continuity let you copy on your iPhone and paste on your Mac.
At work
Businesses manage Macs with Apple Business Manager and mobile device management tools such as Jamf, Kandji, or Intune, which can enforce encryption and updates.
At home
Mac malware such as infostealers has grown as Macs have become more popular. In my opinion, the belief that 'Macs don't get viruses' is outdated and risky.
At work
Plan around Apple's annual release cycle by testing beta versions with key apps, defer major upgrades briefly with MDM, and track hardware support, especially as Intel Macs lose updates.
Real-world examples
At home
Carlos switched from Windows to a Mac. He loved that photos taken on his iPhone appeared on his Mac automatically through iCloud.
At work
Aisha runs IT for a Vancouver design studio. She enrolled every Mac in device management so encryption, updates, and security settings are enforced automatically.
How it compares
| feature | macOS | Windows |
|---|---|---|
| Hardware | Apple Macs only | Many manufacturers |
| Major upgrades | Free, yearly | Less frequent |
| Apple device integration | Excellent | Limited |
| Gaming | More limited | Extensive |
macOS excels at integration and design. Windows at choice and compatibility.
For analysts
When teams request Macs, I'd confirm every critical business app runs on macOS or in a browser first. That one check prevents costly workarounds later.
History & origin
Apple's original Macintosh system software launched in 1984. After struggling to modernize it, Apple bought NeXT, Steve Jobs's company, in 1997 and used its Unix-based NeXTSTEP as the foundation for Mac OS X, released in 2001. Apple moved Macs from PowerPC to Intel chips in 2006, renamed the system OS X in 2012 and macOS in 2016, and began making macOS upgrades free in 2013. macOS Big Sur in 2020 supported Apple's own M1 chips. In 2025, Apple switched to year-based version numbers with macOS Tahoe 26 and said it would be the last major version for Intel Macs. In my view, macOS shows how much an operating system benefits when one company controls the hardware too.