Oreo is a trademark for a popular sandwich cookie

Cookie

In the United States and Canada, a cookie is a small, flat, baked treat, usually containing fat, flour, eggs and sugar. In most English-speaking countries outside North America, the most common word for this is biscuit; in many regions both terms are used, while in others the two words have...

 by the Nabisco

Nabisco

Nabisco is an American brand of cookies and snacks. Headquartered in East Hanover, New Jersey, the company is a subsidiary of Illinois-based Kraft Foods. Nabisco's plant in Chicago, a production facility at 7300 S...

 Division of Kraft Foods

Kraft Foods

Kraft Foods Inc. is an American confectionery, food and beverage conglomerate. It markets many brands in more than 170 countries. 12 of its brands annually earn more than $1 billion worldwide: Cadbury, Jacobs, Kraft, LU, Maxwell House, Milka, Nabisco, Oscar Mayer, Philadelphia, Trident, Tang...

. 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.