A 'service door' is a door that is used for delivery, maintenance, or any other type of service purposes. Other synonyms for this term include loading dock, service entrance, delivery entrance, maintenance entrance, and freight entrance. A loading dock is typically located at the back of a building and is used to load and unload materials from trucks. A service entrance is usually located near the loading dock and is used for employees to enter and exit the building, as well as for deliveries. A maintenance entrance is used by maintenance staff to enter the building. Finally, a freight entrance is used to bring goods and materials into the building. All of these terms can be used interchangeably with 'service door' depending on the context in which it is being used.