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When macOS High Sierra was released, it supported all Macs that can run macOS Sierra: Among the apps with notable changes are Photos and Safari. This makes it similar to previous macOS releases Snow Leopard, Mountain Lion and El Capitan. Its name signified its goal to be a refinement of the previous macOS version, macOS Sierra, focused on performance improvements and technical updates rather than features. The name "High Sierra" refers to the High Sierra region in California.
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macOS High Sierra was announced at the WWDC 2017 on J and was released on September 25, 2017. MacOS High Sierra (version 10.13) is the fourteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers.
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