A coffee machine is a device used to brew coffee by heating water and passing it through ground coffee beans. There are various types of coffee machines, including drip coffee makers, espresso machines, and single-serve pod machines. Each type has its own method of brewing, but they all aim to extract flavors from the coffee grounds to create a beverage. Most coffee machines consist of a water reservoir, a heating element, and a brewing chamber. Users typically add water and coffee grounds, select their desired settings, and start the machine. Popular brands include Keurig, Nespresso, and Cuisinart, each offering unique features to enhance the coffee-making experience.