An **espresso machine** is a device used to brew espresso, a concentrated coffee, by forcing hot water through finely-ground coffee beans under high pressure. It comes in various types, including manual, semi-automatic, automatic, super-automatic, and pod-based, each offering different levels of control and convenience. Key features include a pump, boiler, portafilter, and steam wand for frothing milk. Popular brands include Breville, DeLonghi, and Nespresso.