Cappuccino is a coffee drink which

Cappuccino is a coffee drink which today is composed of espresso and hot milk, with the surface topped with foamed milk.[2] Cappuccinos are most often prepared on an espresso machine. The espresso is extracted into the bottom third of the cup, followed by a similar amount of hot milk, which is prepared by heating and texturing the milk using the espresso machine steam wand. The top third of the drink consists of milk foam; this foam can be decorated with artistic drawings made with the same milk, called latte art. In a traditional cappuccino, as served in Europe and artisan coffee houses in the United States, the total of espresso and milk/foam make up between approximately 150–180 ml (5–6 imp fl oz; 5–6 US fl oz). Commercial coffee restaurant chain in the US more often serve the cappuccino as a 360 ml (13 imp fl oz; 12 US fl oz) drink or larger.[3]

Cappuccino differs from caffè latte foremost in size: Cappuccino is traditionally small (max 180 ml), while 'latte' traditionally is large (200 ml-300 ml). Cappuccino traditionally has a layer of textured milk micro foam exceeding 1 cm in thickness; Micro foam is frothed/steamed milk in which the bubbles are so small and so numerous that they are not seen, but it makes the milk lighter and thicker. As a result the micro foam will remain partly on top of the mug when the espresso is poured in correctly as well as mix well with the rest of the cappuccino.

Caffè Latte is often served in a large glass; cappuccino mostly in a 150 - 180 ml cup with a handle.

The World Barista Championships have been arranged annually since 2000, and during the course of the competition, the competing barista must produce -for four sensory judges- among other drinks four cappuccinos, defined in WBC Rules and Regulations as [...] a coffee and milk beverage that should produce a harmonious balance of rich, sweet milk and espresso [....] The cappuccino is prepared with one (1) single shot of espresso, textured milk and foam. A minimum of 1 centimeter of foam depth [....] A cappuccino is a beverage between 150 ml and 180 ml in total volume [....] [4]