Chocolate Liqueur is one of the more popular members of the greater liqueur family. There are a wide variety of liqueurs flavored with chocolate, which often fall into the cream liqueur category.
Crème de cacao is one of the original styles of chocolate liqueur, although it doesn't actually contain any cream – its name refers to the silky texture of the drink.
Some chocolate liqueurs may contain chocolate, but most will be based on a chocolate essence that has been added to a neutral base spirit. When real chocolate is used, glycerine is often added to prevent the heavily viscous chocolate separating from the rest of the beverage.