Can SomeOne Clear This Up For Me?

[Lukey Boy]

I've become really interested in this "hacking" and "cracking scene, i really think it can be a valuable use of time. I'm in my final year of school, and school filters are getting in my way but im coping. What I really want to know is some definitions of the trade. I mean, i know various virus definitions but things like keyloggers and trojans really tickle my pickle, its really a big black whole.. Any help?

LukeyBoy