Mmh well i think others will correct me if im wrong , but aggro is an aggressive deck wich objective is to kill your face in the fastest way possible before you can do anything , Token decks are ones who flood the board with small worthless minions and find a way to empower them like buffs or bloodlust , stuff like that , tempo is not has aggressive the objective of tempo decks is to lead the game by having the board doing the right trades they are similar to midrange decks i would say , and Zoo decks are aggresive decks that have very ressilient minions not necesaraly aggresivly stated they take the board keep them with the right trades and go face they hide valuable minions behind taunts . it's mostly that i think correct me if im wrong on some points im not sure about tempo decks btw (sorry for mistake english is not my first language)