What is a Room Type?
A ‘Room Type’ is a description of the characteristics of a room, including occupancy and price; a ‘Room’ is an actual room where a guest stays. Rooms are grouped by type to spare you the effort of creating basically the same room numerous times.
For example, a hotel may have 20 rooms that have one bed and accommodate a single guest. Since these rooms are basically the same in characteristics and price, the hotel may create a room type 'Single' and add 20 rooms to it.