OS X Lion is the eighth major release of macOS, the operating system for Apple's Mac computers. It was released on July 20, 2011 and introduced over 250 new features and enhancements to the operating system. Some of the key features of OS X Lion include the Launchpad, which provides a grid of app icons for easy access to applications, full-screen apps that allow users to take advantage of their entire display, Mission Control for managing open windows and applications, and a new version of the Mail app with Conversations view. OS X Lion also introduced new multi-touch gestures for trackpads and mice, as well as improvements to system-wide auto-saving and versioning. With a focus on user-friendly features and a streamlined user interface, OS X Lion was well-received by users and critics alike.
