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PC stands for Personal Computer and Mac is short for Macintosh. Macintosh computers ('Macs') are made by Apple, Inc., and run an Operating system called Mac OS X, which is widely regarded by Technology experts as the most advanced and most secure consumer operating system in the world. The term PC comes from the first personal computer made by IBM.
A number of different OS are compatible with PCs, the most popular of which is Microsoft Windows. PC can run other operating systems such as Linux. Macs are traditionally classified separately from PCs because they are based on the PowerPC architecture from Apple/IBM/Motorola etc.
PCs and Macs are still not 100% compatible, despite their now similar architectures. While many software vendors release their products for both platforms, not all do. Particularly, most of the popular computer games are PC-only. The latest version of Mac OS X is version 10.5 'Leopard'.