What audience is each video game rating designed for

E is for Everyone. so tht means you, your grandma, and you little brother.
E+10 is Everyon Ten and Up. so only if you're older than ten.
T is for Teen. so 13 and up.
M is for Mature. this one is kind of up to who's buying it. a parent can let their kid get these if they think the kid is mature enough to handle it. a great example is GTA, which I'm sure you've heard stories about.
AO is Adults Only. this is the really big stuff. like, things so bad that most stores won't even think about selling them. none of this 'till either above 17 or 21. can't remember which.