First one is the traditional type, coined as the pop-up toaster. It originated in the early 20th century, and can be found in most homes today. Second type is called a conveyor toaster. These are almost always used in commercial kitchen and factories. The main purpose behind their functionality, is to be able to toast hundreds or even thousands slices of bread in a matter of hours. Third type of toaster is a toaster oven. This is something that is used for much more than just baking and toasting bread. We have a separate guide that talks in-depth about them.