Burnham is a small crater located to the southeast of the crater Albategnius, in a smooth area of the lunar surface. To the southwest is Vogel. The irregular tooth-like shape of the rim protrudes to the southwest, giving the wall a distorted, asymmetric appearance. There are breaks in the rim to the northwest and southwest, the later forming a valley running about 15 km. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.