Krafft is a prominent lunar impact crater located near the western edge of the Oceanus Procellarum. To the north is the lava-flooded walled plain Eddington. Almost due south is the crater Cardanus, and the two are connected by a 60-kilometer-long chain of craters known as the Catena Krafft. Krafft has a sharp, circular rim with a rampart on the exterior, and no central peak. (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.