| Bots are programs that "play" for you while you are away. They can usually do whatever you want them to do such as fishing, crafting, or just leveling. Some are advanced that they'll go to the stores and pickup supplies and repair for you.
Gliders I believe are a type of bot, that not has been very successful, but also caught a lawsuit from Blizzard on the basis of the name that it used to have (used to be known as WOWGlider, now changed to MMOGlider I believe). Alot of people have them, as for their profiles, I would assume that they're a specific persons account and what privileges they have, as there are 2 types of accounts: normals and elite (to my knowledge)
Hacks are programs that allow your character to do things that a person is not suppose to do. mainly hacks either bend the physics of the game (jump higher, run faster, kinda like Game Genie or Pro Action Replay for MMOs)
That's pretty much my knowledge on the subject, not very deep since I don't use them, but have been tempted.  | 
