The all-new Sidecar feature enables users to extend their Mac desktop by using their iPad as a second display or as a high-precision input device across creative Mac apps. With macOS Catalina, Apple is replacing iTunes with its popular entertainment apps - Apple Music, Apple Podcasts and the Apple TV app. San Jose, California - Apple today previewed macOS Catalina, the latest version of the world’s most advanced desktop operating system, packed with cool new features, fresh new apps and powerful new technology for developers.