Basically butter and the other main ingeridient, the egg, makes the cake softer.
Butter cakes rely on leavening agents such as baking powder, baking soda, or yeast
it makes it YUMMY!!!!!!!!!!!!!!!!!!!!!---Butter makes it tender.Butter adds some colour to the cake ~ with shortbread it gives it the yellowy colour.
Possibly. Since the main ingredient is butter, they could be almost any flavor.
Butter cakes include pound cakes