Built on a rock-solid UNIX foundation and designed to be simple and intuitive, it’s what makes the Mac innovative, highly secure, compatible, and easy to use. Quite simply, there is nothing else like it.
Some programs aren't compatible/havent been released yet.
Software designed to control the hardware of a specific data-processing system in order to allow users and application programs to make use of it.
it's almost free, the source code is included, bugs are quick fixes, multi user multiu tasking.
hard to install, learn and use.
90% of all computer users