Vindication is a sweet thing — when you get vindication, you've been proven right or justified in doing something. Everyone accused of a crime craves vindication.
Vindication is good, but it can only come after something bad, like being accused of something you didn't do. If a teacher thought you cheated, but then announced to the whole class that you didn't, you're getting vindication. An accused criminal who is exonerated — cleared of the crime — gets vindication. If you believe something crazy — like that your underdog sports team could win a championship — and it comes true, that's a vindication of your beliefs.