You’ve most likely seen (or eaten) rich, fluffy buttercream frosting on top of a cake or a cupcake. Buttercream is popular for good reason: It's easy to color, takes to many flavorings and makes a great decorating medium. There are a few different kinds — the main ones are American, French, Swiss and Italian — which range in fluffiness, color, lightness and stability. Each is enticing in its own way, and some are simpler to make than others. Click ahead for an overview.