Cinemablend made up the below great graphic to explain the film.
SPOILER WARNING: What follows should only be viewed by people who have already seen Inception. It contains heavy, critical spoilers which will impact your viewing of the film. If you haven’t seen Inception yet, stop reading and don’t come back until you do.
|CLICK on graphic for bigger view|
Screen Rant had a great detailed artice "Inception Ending Explained" where they break down all of the characters, their roles and what the HECK they were doing in the dream (yes it was several levels of ONE dream), but wouldn't that in effect be seperate dreams? LISTEN, it makes more sense to think of it as several different floors of the same building. In any case check out Screen Rant's explanation here
You can go to Cinemablend's site here
Cool Black's 2010 Entertainment Review
Best Picture Race 2011