macOS 10.15: Catalina (Jazz)

macOS Catalina (version 10.15) is the sixteenth and, as of June 2020, current major release of macOS, Apple's desktop operating system for Macintosh computers. It is the successor to macOS Mojave. It was announced at WWDC 2019 on June 3, 2019, and was released to the public on October 7, 2019. Catalina is the first version of macOS to support only 64-bit applications and the first to include Activation Lock.