A half-marathon is a long-distance running event that covers a distance of 13.1 miles, or approximately 21.1 kilometers. It is a popular race for both amateur and experienced runners, offering a challenging yet achievable goal for those looking to improve their fitness or compete in running events. Many half-marathons take place in scenic locations and often attract large numbers of participants. Runners typically train for several months to prepare for the race, focusing on building endurance and speed. Events may also include activities like 5K races or fun runs to encourage community participation.