Oreo cookies are a popular sandwich cookie consisting of two dark chocolate wafers with a sweet cream filling in between. They were first introduced in 1912 by the Nabisco company and have since become one of the best-selling cookies in the world. The unique combination of flavors and textures makes Oreo cookies a favorite for many. They can be enjoyed on their own, dunked in milk, or used as an ingredient in various desserts, such as ice cream and cheesecake.