The Aesir are a group of gods in Norse mythology, representing the primary pantheon of deities worshipped by the ancient Norse people. They are associated with war, power, and governance, and include well-known figures such as Odin, Thor, and Frigg. The Aesir play a central role in various myths, tales, and sagas that detail their relationships, conflicts, and interactions with other beings like the Vanir and giants.