In Norse mythology the valkyries are dísir, minor female deities, who served Odin. The valkyries' purpose was to choose the most heroic of those who had died in battle and to carry them off to Valhalla where they became einherjar. This was necessary because Odin needed warriors to fight at his side at the preordained battle at the end of the world, Ragnarök. In Valhalla the valkyries also “serve drink and look after the tableware and drinking vessels” (Prose Edda Gylfaginning 36).
In Gylfaginning of the Prose Edda and the poem Grimnismál of the Poetic Edda, it is said that Freyja receives half of the slain heroes in her hall Fólkvangr, however there is no descriptions about life at Fólkvangr. Freyja is also called Vanadís, which suggests that she is related to the dísir.
It appears, however, that there was no clear distinction between the valkyries and the norns. Skuld is for instance both a valkyrie and a norn, and in the Darraðarljóð (lines 1-52), the valkyries weave the web of war (see below). According to the Prose Edda (Gylfaginning
Moreover, artistic licence permitted the name Valkyrie to be used for mortal women in Old Norse poetry, or to quote Snorri Sturluson's Skáldskaparmál on the various names used for women: