The document provides an introduction to Mac computers and the Mac OS X operating system. It discusses what Macs are, the current Mac models including Mac Mini, iMac, Mac Pro, MacBook, MacBook Pro and MacBook Air. It also summarizes the different versions of Mac OS X from Cheetah to Mountain Lion and the reasons for using Mac OS X over older Mac operating systems. Finally, it outlines some common desktop icons, applications that come with OS X and other essential Mac functions.