I need a wedding cake ,a traditional cake served at wedding receptions. 
Having a wedding, eh?  Are you talking about those multi-layer cakes with the white icing on it?
Yeah,but that has to do with Cake decorating is one of the sugar arts that uses icing or frosting and other edible decorative elements to make plain cakes 
Is that true of the groom's cake, the little side cake that's usually chocolate-flavored?
Groom's cake
A groom's cake is a wedding tradition originating in Victorian England, but observed more often in the modern age in the American South.
While a wedding cake may often be decorated in white and light in texture or color, the groom's cake can take a variety of forms, many incorporating chocolate or fruit. Cheesecake sometimes serves as a groom's cake. The groom's cake is often served at a table separate from the wedding cake at a wedding reception or wedding breakfast, though it may
Cake decorating
Cake decorating is one of the sugar arts that uses icing or frosting and other edible decorative elements to make plain cakes more visually interesting. Alternatively, cakes can be molded and sculpted to resemble three-dimensional persons, places and things.
Cakes are decorated to mark a special celebration (such as a birthday or wedding). They can also mark national or religious holidays, or be used to promote commercial enterprises. However, cakes may be baked and decorated for almost any social occasion.
History.