Invisible Children is a charity that is trying to help Northern Ugandans escape war and poverty. Children fight in the war going on in Uganda and Invisible Children is trying to stop the war so they can't fight. It is Africa's longest war. The vote you give to Invisible Children will help the charity be able to get $1 million. The link above explains what they are doing with the money.
This is the film. It explains what is going on in Northern Uganda.