#1
can someone briefly explain to me what guitar pro and power tab are, i know they are software to download but are they better tabs or something?

#2
They're midi files that let you play songs and watch the tab at the same time.
They help if you're not sure of a rhythm or how to play something and help you to keep your place in the song.

The actual tab quality depends on who has tabbed them though. Some can be crap, but usually they're pretty good, as someone has sat there, worked out how to notate the rhythms as well as the notes and had the time to do it, so they're usually decent.