Oreo is a brand of sandwich cookie consisting of two chocolate wafers with a sweet creme filling in between. It was first introduced by Nabisco in 1912. Oreo is one of the best-selling cookies in the world, with over 450 billion cookies sold since its introduction. Oreo cookies are available in a variety of flavors, including original, double stuffed, golden, thins, and birthday cake. They are also available in a variety of limited-edition flavors, such as lemon, pumpkin spice, and mint chocolate chip.Oreo cookies are a popular snack food and are often eaten with milk. They are also used in a variety of recipes, such as milkshakes, cakes, and pies.