A red velvet cake is a type of rich and sweet cake which has a distinctive dark red color. Common ingredients include buttermilk, butter, flour, cocoa powder, and red food coloring. It is most popular in the Southern United States, though known in other regions. The most typical frosting for a red velvet cake is a butter roux icing also known as a cooked flour frosting. Cream cheese buttercream frostings are also popular.
The best one I ever had came from Washington, Louisiana.