Subway is an American fast food restaurant franchise that primarily sells submarine sandwiches (subs) and salads. It is owned and operated by Doctor's Associates Inc. Subway is one of the fastest growing franchises in the world, with 44,105 restaurants in 110 countries and territories as of August 6, 2015. It is the largest single-brand restaurant chain and the largest restaurant operator in the world. More: en.wikipedia.org.