Daly is a small lunar impact crater that is located in the eastern part , to the northwest of the crater Apollonius. The inner wall is wider in the southern half than in the north. The crater intrudes into the comparably sized crater Apollonius F to the east-southeast. (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.