The term "postern doors" refers to back or side entrances to a building, typically smaller and less prominent than the main entrance. Synonyms for postern doors include rear doors, side doors, secondary entrances, back doors, and service doors. These entrances are often used for more functional purposes, such as deliveries, utilities access, or employee entrances. While they may not always be as aesthetically pleasing as the main entrance, postern doors are important features of many buildings. They provide convenience and accessibility for employees or visitors, while also offering an alternate route in case of emergency. The use of postern doors may vary depending on the type and function of the building they are a part of.