Oreo is a trademark for a popular sandwich cookie by the Nabisco Division of Kraft Foods. The current design consists of a sweet, white filling commonly referred to as 'cream' or 'creme', sandwiched between two circular chocolate or golden cookie pieces.

Over 491 billion Oreo cookies have been sold since they were first introduced, making them the best selling cookie of the 20th century. [More at Wikipedia]
Bio: Your favorite cookie, filling your world with Wonder 280 characters at a time.