Coffee machines are appliances designed to brew coffee by heating water and passing it through ground coffee. They come in various types, including drip coffee makers, espresso machines, and single-serve pod machines. Each type offers different brewing methods and flavors, catering to diverse preferences. Most coffee machines have features like programmable settings, built-in grinders, and milk frothers. They can vary in size and price, making it easy for consumers to find one that fits their kitchen space and budget. Popular brands include Keurig, Nespresso, and Breville, each offering unique functionalities and designs.