Swiss meringue is a type of meringue made by gently heating egg whites and sugar together over a warm water bath until the sugar dissolves, then whipping the mixture until it forms stiff, glossy peaks. It is known for being stable and fluffy with a marshmallow-like texture and smooth, spreadable consistency. Swiss meringue is often used for frostings, toppings on pies, and as a base for Swiss meringue buttercream, which includes butter for a creamy, silky frosting. It is stable even in warm weather and lighter than many other frostings.