A marathon is a long-distance running event that covers a distance of 26.2 miles (42.195 kilometers). It is typically held on roads and can be completed by both professional athletes and amateur runners. Marathons often take place in various cities around the world, attracting participants of all skill levels. The origin of the marathon dates back to ancient Greece, specifically the legend of Pheidippides, a messenger who ran from the battlefield of Marathon to Athens to announce victory. Today, marathons are popular events that promote fitness, community, and charitable causes, with many races offering support for various organizations.