What does the end of inception mean?

The end of Inception is deliberately meant to be ambiguous and there is no clear answer.

Essentially, Christopher Nolan introduced the idea of the Totem with Cobb as a way to determine whether he was dreaming or not. His totem was a top. If he spun it and it fell, he was in reality. If it kept spinning, he was dreaming.

Because the film cuts to black before we see the top fall, we are uncertain of whether Cobb meeting his children is still a dream or reality.

This comes down to two theories.

1) If the totem falls, he is in reality, which means that his team successfully introduced the idea for Maurice Fisher to break up his conglomerate. This would mean that Saito would help remove the murder charge that hangs over Cobb, allowing him to see his children.

2) If the totem does not fall, he is still dreaming and his team failed the mission.