A marathon is a long-distance running event that covers a distance of 26.2 miles (42.195 kilometers). It is often held on roads and attracts runners of all skill levels, from beginners to elite athletes. Many people participate in marathons to challenge themselves, improve their fitness, or raise money for charity. The most famous marathon is the Boston Marathon, which has been held annually since 1897. Other well-known marathons include the New York City Marathon and the London Marathon. These events often feature thousands of runners and are celebrated with cheering crowds, making them exciting experiences for participants and spectators alike.