Auwers is a small lunar crater that is located in the Montes Haemus mountain range at the south edge of Mare Serenitatis. It lies to the southeast of the crater Menelaus. The irregular rim has a gap at the north-northwest edge, which allowed lava flows to reach the crater floor and flood the interior. (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.