The document provides an overview of Greek gods and goddesses. It discusses the difference between Olympians and non-Olympians, with Olympians being the 12 main gods that lived on Mount Olympus. Brief descriptions are given for major Olympians like Zeus, Apollo, Athena, Aphrodite, Poseidon, Hades, and Hercules. Non-Olympian gods Ares is also described. Resources on Greek mythology are listed at the end.