<Tr> <Th> OS family </Th> <Td> <Ul> <Li> Macintosh </Li> <Li> Unix </Li> </Ul> </Td> </Tr> <Ul> <Li> Macintosh </Li> <Li> Unix </Li> </Ul> <Tr> <Th> Source model </Th> <Td> Closed source (with open source components) </Td> </Tr> <Tr> <Th> Released to manufacturing </Th> <Td> September 30, 2015; 2 years ago (2015 - 09 - 30) </Td> </Tr>

Mac os x yosemite upgrade to el capitan