Muhammad Ali is a retired professional boxer, civil rights activist, actor, author, and poet. He is widely regarded as one of the greatest athletes of all time and was a prominent figure in the Civil Rights Movement in the United States, speaking out against racism and discrimination. His boxing career was marked by his fast reflexes and his "float like a butterfly, sting like a bee" ring style, which made him nearly impossible to hit. In the ring, he won the world heavyweight championship three times and was the first man to do so. Outside of the ring, he was known for his humor, passion, and charisma, and he was beloved by millions of fans around the world.