Froth

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Froth is foam consisting of bubbles in a liquid.

One common form of froth is milk froth deliberately created as part of a drink. Many italian-style coffees are made using a combination of espresso coffee, steamed milk and frothed milk. Most espresso machines have a steam pipe which is used to bubble steam through milk in order to froth it. This frothed milk is then poured on top of the drink.