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Who Wants to Be a Millionaire is a game show where contestants answer multiple-choice questions to win a large cash prize. Hosted by Regis Philbin, the show became an international sensation after its 1999 debut. Its fast-paced format, iconic music, and the use of lifelines like "Phone-a-Friend" and "Ask the Audience" captivated viewers worldwide, making it one of the most popular game shows of all time.