Störmer lies in the northern part of the lunar surface, to the southeast of the crater Olivier and to the north of van Rhijn. The edge of the rim is sharply defined, and the inner wall is terraced along the northwestern side. The interior floor is level, with a double-peak formation at the midpoint. (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.