Flats are self-contained residential units occupying part of a larger building. They are usually set out on a single storey of a building and it is for this reason that in some regions (UK, India etc.) they are referred to as "flats". The term "flat" is used in the UK, India and places that use British English. In Europe, North America and places that use American English, the word apartment is preferred. Flats have their own front door, kitchen, toilet and bathroom. In some countries a 1-bedroom apartment may be advertised as a 1bhk or 1bhk flat. The term "bhk" or "BHK" refers to bedroom, hall and kitchen. This means that the unit would have 1 bedroom, a hall (lounge/sitting room) and kitchen. Flats can be found in residential blocks or towers and sometimes even as a part of a house or villa where a whole floor or a section of it, has been separated to have its own entrance etc.