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 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.

It is the largest single-brand restaurant chain, and the largest restaurant operator, in the world.