A porch (from Old French porche, from Latin porticus "colonnade", from porta "passage") is a construction usually external to the walls of the main building proper, but may be enclosed by latticework, broad windows, screen, or other light frame walls extending from the main structure.
There are various styles of porches, all of which depend on the architectural tradition of its location. All porches will allow for sufficient space for a person to comfortably pause before entering or after exiting the building. However, they may be larger. Verandahs, for example, are usually quite large and may encompass the entire facade as well as the sides of a structure. An extreme example is the Grand Hotel on Mackinac Island, Michigan, which has the longest porch in the world at 660 feet (200 m) in length.
In northeastern North America, a porch is a small area, usually unenclosed, at the main-floor height and used as a sitting area or for the removal of working clothes so as not to get the home's interior dirty, when the entrance door is accessed via the porch. In the Southwestern United States, ranch-style homes often use a porch to provide shade for the entrance and southern wall of the residence.
In the Southern United States and Southern Ontario, Canada, a porch is often at least as broad as it is deep, and it may provide sufficient space for residents to entertain guests or gather on special occasions. Adobe-style homes in Santa Fe, New Mexico, often include large porches for entertainment called 'portals,' which are not usually seen in the more traditional adobe homes.
Older American homes, particularly those built during the era of Victorian architecture, or built in the Queen Anne style, often included a porch in both the front and the back of the home. The back porch is used as another sitting space. However, many American homes built with a porch since the 1940s have only a token one, usually too small for comfortable social use and adding only to the visual impression of the building.