What is a Crumb Coat?

Strange name?  Well, I guess I should quickly explain...a crumb coat is the first layer of icing that traps in the crumbs.  This makes applying your final coat easier, and gives it a smoother finish.  After your cake is completely cool, cover it with a thin layer of icing (a thinner consistency is easier to spread during this step) and let dry.  The icing should be dry to the touch before applying the final coat.  A crumb coat also serves as an adhesive when applying fondant.  Hope that helps!