Subway is an American privately held fast food restaurant franchise that primarily sells submarine sandwiches (subs) and salads. Subway is one of the fastest-growing franchises in the world[2] and, as of June 2017, has approximately 45,000 stores located in more than 100 countries. More than half of the stores are located in the United States.[1][3][4] It is the largest single-brand restaurant chain, and the largest restaurant operator, in the world.[5][6][7