It seems a silly question to ask, really. Basically, I've heard of, and seen screenshots of "Final Fantasy Tactics". However, I've never really understood whether it is like the other Final Fantasys, in the typical RPG, level-up, dungeon leads to boss style, or a completely different type of game. Therefore, I was wondering if someone could explain Final Fantasy Tactics, preferably in a nutshell.

And, how come it was never released on PSX in the UK? I know it is out on the GameBoy Advance. Is this the same version, or does it differ slightly/drastically from the original PlayStation version?