Arnold Palmer was a professional golfer and one of the most successful players in the history of the sport. He won seven major championships during his career, including four Masters titles, and was inducted into the World Golf Hall of Fame in 1974. He was also known for his charismatic personality and was nicknamed 'The King' by his fans. He was a pioneer in the sport, helping to popularize it in the 1960s and 1970s, and is credited with helping to make golf more accessible to the masses.