There are a lot of coffee machines such as commercial coffee makers, office coffee makers, home coffee makers, and automatic machine dispensers. The differences between these are self explanatory according to their name itself.
Coffee machines will have two parts the place to put your coffee grounds and a place to put your carafe of made coffee. This is where the similarity ends. Every coffee maker has different filters, different shapes and different sizes. The filters of the coffee maker range from paper gold, to silver to aluminum. There are cone fitters and squared off filters. Then there are glass carafes, thermos carafes or a single cup dispenser. Hot water is poured on to the coffee grounds and the coffee is brewed. It falls into the carafe which is either heated by a heater on the bottom or has a thermos to keep it warm.