What does the movie end means?

Short answer: the final scene is deliberately ambiguous about whether Cobb is awake or still dreaming, but its emotional meaning is clearer: Cobb lets go of his doubt and chooses to be with his children.

Key points from the context:

• We see Cobb return home, spin his totem (a top), then walk away before watching whether it falls; the top wobbles slightly and the film cuts to black, so the literal reality is left unresolved.
• Background: Cobb is tormented by Mal because he once planted an idea in her and that guilt led to her death; his real challenge is accepting she is a projection and stopping himself from being ruled by doubt.
• Evidence for "it's real": Cobb reunites with his children and appears to have released his guilt.
• Evidence for "it's a dream": the unfinished totem test keeps possibility open.
• Bottom line: the film invites debate about the literal outcome, but its intended payoff is emotional—Cobb choosing presence with his children over needing certainty.