Coffee is generally prepared in two ways: espresso and drip brew. Drip brew coffee is prepared by pouring water over coffee which is contained in a filter. Espresso is an Italian coffee beverage prepared by forcing hot water through fine ground coffee beans. Espresso machines come in hundreds of varieties – there are the simplest candle driven models to the very high technology, dual thermostat and multiple-chamber machines you see in today’s cafes. Despite these complexities, espresso machines have very basic cores – they are either steam- or pump- driven.