There were multiple betas released after the keynote. The first public beta was made available on July 9, 2015. The first beta of OS X El Capitan was released to developers shortly following the WWDC keynote on June 8, 2015. OS X El Capitan received far better reviews than Yosemite. El Capitan is the final version to be released under the name OS X. Following the California location-based naming scheme introduced with OS X Mavericks, El Capitan was named after a rock formation in Yosemite National Park. It focuses mainly on performance, stability, and security. OS X El Capitan ( / ɛ l ˌ k æ p ɪ ˈ t ɑː n/ el KAP-i- TAHN) ( version 10.11) is the twelfth major release of macOS (named OS X at the time of El Capitan's release), Apple Inc.'s desktop and server operating system for Macintosh.
