OREO is a trademark for a popular sandwich cookie currently manufactured by the Nabisco Division of Kraft Foods, and when used in reference to the trademark cookie, should always be in all uppercase. The current design consists of a sweet, white filling commonly referred to as 'cream' or 'creme', sandwiched between two circular chocolate cookies.
Over 490 billion OREO cookies have been sold since they were first introduced, making them the best selling cookie of the 20th century.[1] Its most recent packaging slogan is "Milk's Favorite Cookie", which is a slight change from "America's Favorite Cookie."