"Who Wants to Be a Millionaire?" is a quiz show that gives ordinary people the chance to win life-changing amounts of money and for well-known faces to earn cash for charity. Individuals (or groups of two in the celebrity editions) try to answer a series of multiple-choice questions that might lead them to a final question that could see them walking home with £1million if they answer it correctly. If a contestant is unsure of the answer, they can use one or more lifelines. They can ask a computer to randomly eliminate two of the incorrect answer choices in 50/50; Ask The Audience or Phone-A-Friend. The format has sold around the world and airs in more than 100 countries worldwide.