Vestibule (architecture)
A vestibule (also anteroom, antechamber, outer room, windbreak room, air-lock entry, or foyer) is a small room leading into a larger space such as a lobby, entrance hall, or passage, for the purpose of waiting, withholding the larger space from view, reducing heat loss (air trap, windbreak), providing storage space for outdoor clothing (mudroom), etc. The term applies to structures in both modern and classical architecture since ancient times.