Coffee drinks are made by brewing hot water and, occasionally, cold water with ground coffee beans. The brewing is either done slowly by drip, filter, French press, cafetière or percolator, or done very quickly under pressure by an espresso machine. When put under the pressure of an espresso machine, the coffee is termed "espresso" while slow-brewed coffees are generally termed "brewed coffee." While all coffee drinks are based on either coffee or espresso, some drinks add milk or cream, some are made with steamed milk or non-dairy milks, or some beverages add water [Americanos]. Upon milk additions, coffee's flavor can vary with different syrups or sweeteners, alcoholic liqueurs, and even combinations of coffee with espresso or tea.[1] There are many variations to the basic coffee or espresso bases. With the invention of the Gaggia machine, espresso, and espresso with milk such as cappuccino and latte, spread in popularity from Italy to the UK in the 1950s. It then came to America, and with the rise in popularity of the Italian coffee culture in the 1980s it began to spread worldwide via coffeehouses and coffeehouse chains.[2][3] The caffeine content in coffee beans may be reduced via one of several decaffeination processes to produce decaffeinated coffee, also known as "decaf" coffee, which may be served as regular, espresso or instant coffee.