Xandar is the home planet of the Nova Corps.
Xandar was the home of Xandarians, but also of many other species. The Kree accuser, Ronan wants to destroy Xandar due to an ancient war between Xandar and the Kree Empire. Wielding the Power Stone, Ronan almost manages to destroy Xandar but due to the intervention of the Guardians this did not happen. Star-Lord, along with the other Guardians, defeated Ronan, causing the peace in Xandar.
Xandar serves as the basis of attractions related to Guardians of the Galaxy found at Epcot at Walt Disney World, with Guardians of the Galaxy: Cosmic Rewind being centered around representatives of the planet establishing Epcot's first "Other-World" Showcase Pavilion.