macOS Sequoia (version 15) is the latest macOS, launched in September 2024. It follows macOS 14 Sonoma (2023). The current version is macOS Sequoia 15.1.1, a crucial security update.
macOS and Mac OS X History
Since 2001, Macs have run macOS (formerly Mac OS X), a Unix-based system. Before that, Macs used Mac OS 9. Mac OS X evolved from NeXT Computer technology, brought to Apple by Steve Jobs. Over the years, macOS has integrated with iOS, incorporated cloud services, and introduced features like Time Machine, Quick Look, and Desktop Stacks. Learn more about Apple products and services.
Version Names and Codenames
Early Mac OS X versions (Cheetah, Puma, Jaguar, etc.) used big cat names publicly and wine names internally. From 2013, public names switched to California locations, while internal codenames shifted from wines to apple varieties. The "macOS" branding, aligning with iOS and other Apple OSs, began in 2016.
Updates and Support
Apple provides regular updates for the latest macOS (Sequoia). Security updates are also available for the two prior versions (Sonoma and Ventura). Older versions like Monterey are no longer supported. Safari's latest version (18) requires Ventura or later. Stay informed about Apple device updates.
Checking Your macOS Version
To find your macOS version, click the Apple logo, then "About This Mac." This shows your current version and the latest installed update.
Updating to the Latest macOS
Update methods depend on your current macOS version. Older versions used discs and Software Update. Since the Mac App Store (2011), downloads became the norm. From Mojave (2018), Software Updates handles OS updates, often automatically. Find guides for choosing the right Mac.