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OS X was a modern operating system for Apple's Mac computers from 2001 to 2016, known for its UNIX-based stability and the "Aqua" graphical user interface. It was succeeded by macOS and provides fundamental functions like managing hardware and software, running applications, and offering a user-friendly interface with features like the Finder and Dock. The "X" stood for the Roman numeral 10 and is a reference to its UNIX-derived core, which is still present in the current macOS.

Key features and functions

Operating system core: OS X is a Unix-based operating system built on the Darwin kernel, which includes the XNU kernel, combining stability with a user-friendly experience.

User interface: It uses a graphical user interface called Aqua, featuring a desktop background, icons, and the Dock for easy access to applications and files.

Core OS functions: It manages the computer's hardware and software, allocating memory to running applications, and coordinating resources between different programs.

Developer tools: OS X includes an extensive library of functions (API) for developers to use when creating Mac applications.

Multitasking: It introduced advanced multitasking features, such as the ability to create multiple desktops and use gestures to switch between tasks.

Device integration: It supports seamless integration and syncing of data between Apple devices, like iPhones and iPads.