Difference between PC and mac?

With the Intel-based macs, we can install Windows on a mac and run it as if it's running on a PC. That leads me to a question. What exactly is the difference between PC and mac? I know they are different on the OS, but that's just on a software level, which I don't think constitutes the difference. The hard drives are formatted differently on both machines, I know, but we can still use the same hard drive for both a PC or a mac, we just have to format it the right way. So what really is the main thing that constitutes the difference between a PC and a mac? Putting it this way, I can run PC on a mac, can I do it the other way round? Can I install a Mac OS 10.5 on a pure PC made by companies like hp or Dell (or I can easily make one on my own) with an Intel Core 2 Duo/Quad processor, and run the machine like it's a mac?

Allan Eckert wrote:
While some have managed to hack things so that they can install OS X on a PC, the results have been not very reliable. Generally OS X has many part that do not function properly.
It doesn't work well because the Mac hardware itself is different from what is found in any other Intel-based computer. Even the CPU's & support chips are not off-the-shelf Intel parts but variants optimized for Macs that are not available to other computer makers or to DIY enthusiasts.
This is probably why for a time in 2007 the 'fastest Windows notebook on earth' was a MacBook Pro, as tested by PC World, a fact touted for a while in Apple TV ads. (It lost that title to a more conventional Wintel laptop about a month later, but the new champ cost over $5000, had "almost nonexistent" battery life, & weighs over 11 pounds, which should give you some idea of the advantages an Intel-Apple collaboration has over the competition.)

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