Hello, I'm fairly new to macs and in general to computers, and I fell upon Macrumors Forums only a week ago, but so far, I ABSOLUTELY LOVE it! Everyone here is so damn friendly and helpful, it's great! I was cruising through some threads, trying to get information and I stumbled upon a few terms that lost me and I was hoping someone would be willing to explain them: 1) "kernel panic" what is this? 2) "archive and install" again, what is this? Why is it necessary? Does it take up extra space when you do it? When would you do it? 3) What do people mean when they say "my mac crashed". Do they mean when a program freezes and you have to shut your computer down and restart it, do they mean when the whole system crashes and you have to redo everything on the computer. I'm used to PCs, and when my PC crashed, all hell broke loose (especially since I'm not good with computers). I was under the impression that Macs didn't crash very often. 4) Why would you reinstall an OS on your computer? 5) Lastly, people have told me it's a good idea to have a backup system for your computer and I agree, but how would you go about doing this for a mac? Would you just use some sort of external HD? Thanks in anticipation folks! Sorry if my questions seem simple/stupid...like I said, I'm really VERY new to macs.