Garrison is a style of architecture characterized by a rectangular shape, steeply pitched roofs, and decorative elements such as cornices and pilasters. It originated in New England during the 18th century and was commonly used for military forts, hence the name "Garrison." This style is known for its simple and functional design, often featuring symmetrical facades and minimal ornamentation. The other architectural styles listed, such as Salt Box, Prairie Style, Gambral, and Greek Revival, are different from Garrison in terms of their design elements and historical origins.