A marathon is a long-distance running event with a length of 26.2 miles (42.195 kilometers). This distance is standardized and recognized in major marathon events globally, originating from the historical run of Pheidippides, a Greek messenger who allegedly ran from the battlefield of Marathon to Athens. The marathon has since become a popular event among amateur and professional runners, symbolizing endurance and mental toughness. Major marathons, such as the Boston Marathon and the New York City Marathon, attract thousands of participants each year, celebrating athletic achievement and community spirit.