Originally Posted by Kspeelman
Please explain root
Root is basically taking your phone back to before the end-user settings. Meaning, it will take it back to the development stage allowing you to highly customize your phone with different ROM's [such as Hero, Droid, Nexus One, etc.] and also tinker with settings you could not access as an end-user.
BE VERY AWARE THAT ROOTING YOUR PHONE VOIDS YOUR WARRANTY. SO ROOT AT YOUR OWN RISK.