The primary difference between an amateur and a professional athlete lies in their level of commitment, skill, and compensation. Professionals earn a living through their sport and typically have extensive training, experience, and high skill levels. They compete in official leagues, often under contracts, and must adhere to strict training regimens. Amateurs, however, typically participate for enjoyment or personal development and may not receive financial compensation. Their commitment can vary, and they may compete in less formal settings or as part of club teams without professional obligations.