-Identity diffusion: Where the person doesn't have a darn clue who they are but don't care to try new things so that they can get an idea. These people are floaters. No commitment, no crisis=nothing.

Identity foreclosure: It's funny, I thought of a house embodiment of "identity" with the little foreclosure sign. As I'm typing I think I've developed a better understanding through my ridiculous analogy. An identity foreclosure is when you (the owner of your identity) let someone else (usually parents) tell you what your identity should be as soon as you show that you're unsure. Commitment, no crisis=parental smack down takeover.
Identity moratorium: Different from identity diffusion in that they put a bit more effort in "putting themselves out there"(as my mother lovingly tells me all the time) and they may or may not have a general idea of themselves or are at least trying a little more compared to identity diffusion. crisis time+to commit or not commit?= unsure but trying.
Identity achievement:
The grande finish line of identity, where you have overcome your crisis and know who you are and work your butt off to make you the best you yada yada. (I'm jealous of these people therefore the sass)