Subway is an American restaurant franchise that primarily sells submarine sandwiches (subs) and salads. It is owned and operated by Doctor's Associates, Inc. (DAI). Subway is one of the fastest growing franchises in the world with 36,909 restaurants in 100 countries and territories as of June 1, 2012. It is the largest single-brand restaurant chain globally and is the second largest restaurant operator globally after Yum! Brands (over 37,000 locations).