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Elaine Marie Benes is a fictional character on Seinfeld, played by Julia Louis-Dreyfus.

She used to date Jerry Seinfeld, and their characters remained close friends. This is usually explained when one of them is introducing the other, though the explanation is often not necessary. Her other main friends were George
Elaine Benes is one of Jerry Seinfeld’s best friends. She is also warm and fuzzy with George and Cosmo Kramer as well, mainly by association. His strongest friendship, by far, is that with Jerry. As Jerry’s ex-girlfriend, Elaine knows him well and adds a good dimension to the show that allows the viewer to better understand Jerry and the rest of the characters on Seinfeld.
Elaine was the only character, of those mentioned above, missing from the pilot episode. She would make her first appearance in the second episode, "The Stake Out". Her character was added because NBC executives felt the show was too male-centric, and demanded that creators Jerry Seinfeld and Larry David add a woman to the cast, or the show would not be renewed.

Elaine[seinfeld.wikia.com]
Marie[samepageteam.files.wordpress.com]
Benes[cdn.playbuzz.com]