A closed part of the building is generally referred to as a basement, which is completely or mainly below the earth's surface.

Since the use of cellars has evolved massively over time from being a buffer zone between the ground and the building, later as a store for vegetables and fruit, and today to being converted into a hobby room or guest room, the variety of cellars found today is almost inexhaustible.

Anyone who would like to find out more about special forms such as the high, low, crawl or earth cellar is recommended to read the corresponding article on Wikipedia.