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.

In the United Kingdom, froth is also used to describe the layer of bubbles at the top of a glass of beer.