The Chicago Marathon is an annual marathon race held in Chicago, Illinois. It typically takes place in October and attracts thousands of runners from around the world. The course is known for its flat and fast route, making it a popular choice for both amateur and professional runners aiming for personal bests or qualifying times for other major marathons. Established in 1977, the Chicago Marathon is part of the World Marathon Majors, which includes other prestigious races like the Boston Marathon and the New York City Marathon. The event features a diverse range of participants, including elite athletes, charity runners, and recreational joggers, fostering a sense of community and celebration throughout the city.