Coffeemakers or coffee machines are cooking appliances used to brew coffee. While there are many different types of coffeemakers using several different brewing principles, in the most common devices, coffee grounds are placed into a paper or metal filter inside a funnel, which is set over a glass or ceramic coffee pot, a cooking pot in the kettle family. Cold water is poured into a separate chamber, which is then boiled and directed into the funnel. This is also called automatic drip-brew.