 A cappuccino is traditionally served in a porcelain cup, which has far better heat retention characteristics than glass or paper.The foam on top of the cappuccino acts as an insulator and helps retain the heat of the liquid, allowing it to stay hotter longer.A "cortado" (also known as ""pingado"" or ""garoto"") is an espresso "cut" (from the Spanish and Portuguese "cortar") with warm milk to reduce the acidity.