The finalists perform hoping to impress the judges and viewing public. The judges give their verdicts after each act have performed. After all the acts have performed the phone lines are opened for tonight's public vote.
Britain's Got Talent is a reality talent show hosted by Ant and Dec. Any sort of entertainment act is able to enter the competition and hopefully impress the judges and make it through to the final stages of the competition.
The series winner's prize is £100,000 and the chance to perform at the Royal Variety Show. The judges on the show are Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams.
Britain's Got Talent - Series 3, The Final Synopsis and Schedule