The Golden Age of Hollywood began with the introduction of sound in cinema, known as 'talkies.' This era saw the rise of major film studios like MGM, Warner Bros., and Paramount, which dominated the industry. It was a time of lavish musicals, epic dramas, and the star system, where actors like Humphrey Bogart, Katharine Hepburn, and Bette Davis became household names. Films like 'Gone with the Wind' and 'Casablanca' became classics, cementing this era as a pinnacle of cinematic history.