Explanation:

Muhammad Ali, born Cassius Clay, transcended the sport of boxing to become a global cultural icon and advocate for social justice. Known for his unparalleled boxing skills, charismatic personality, and outspoken activism, Ali earned the monikers "The Greatest" and "The People's Champion" through his remarkable achievements inside and outside the ring. His legendary battles with opponents such as Joe Frazier, George Foreman, and Sonny Liston captivated audiences and cemented his legacy as one of the most influential figures in sports history. Ali's impact extended far beyond boxing, as he used his platform to champion civil rights, peace, and humanitarian causes.