The initial development of Mac OS X was led by Avie Tevanian, who had previously worked at NeXT and had played a key role in the development of NeXTSTEP. The development of Mac OS X 10.0 began in 1998, after Apple acquired NeXT Computer, which was founded by Steve Jobs after he left Apple in the mid-1980s.

Six months after its release, Mac OS X 10.0 was succeeded by Mac OS X 10.1, code named Puma. This was important for compatibility reasons while many Mac OS 9 applications could be run under Mac OS X in the Classic environment, some, such as applications that directly accessed hardware, could only run under Mac OS 9. The core components of Mac OS X were open sourced as Darwin.īoxed releases of Mac OS X 10.0 also included a copy of Mac OS 9.1, which can be installed alongside Mac OS X 10.0, through the means of dual booting (which meant that reboots are required for switching between the two OSes). Many technologies were ported from the classic Mac OS, including Sherlock and the QuickTime framework. It introduced the Quartz graphics rendering engine for hardware-accelerated animations. It was derived from NeXTSTEP and FreeBSD, and featured a new user interface called Aqua, as well as improved stability and security due to its new Unix foundations. Mac OS X was Apple's successor to the classic Mac OS.

It was released on March 24, 2001, for a price of $129 after a public beta. Mac OS X 10.0 ( code named Cheetah) is the first major release of Mac OS X, Apple's desktop and server operating system.

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