Muhammad Ali, born Cassius Marcellus Clay Jr. on January 17, 1942, was an American professional boxer and cultural icon. He is widely regarded as one of the greatest boxers of all time, known for his exceptional speed, agility, and unique fighting style. Ali became the world heavyweight champion three times and was famous for his fights against Sonny Liston, Joe Frazier, and George Foreman. Beyond boxing, Ali was a prominent figure in the civil rights movement and a vocal advocate for social justice. He refused to be drafted into the Vietnam War, citing his religious beliefs and opposition to the conflict, which led to a significant legal battle. His legacy continues to inspire many around the world.