Oreo is a popular brand of cookie, made by Nabisco. It consists of two chocolate wafers with a sweet cream filling in between. The filling has different flavors including original, mint, lemon, peanut butter and birthday cake. Oreos are often eaten as a snack or dessert and can be enjoyed with milk or used to make other desserts such as ice cream sandwiches and milkshakes. They are also popular for dunking in milk due to their creamy texture and rich flavor.