Shake Shack is a fast casual chain of restaurants that is located in the United States with its base in New York City. This restaurant began as a food cart that was located in Madison Square Park. It opened in the year 2004. As its popularity grew, it moved to a stand, and now it is one of the fastest growing locations in the United States. It currently has more than 136 locations that specialize in New York Style hot dogs, hamburgers, fries, and milkshakes that its known for, far and wide.