Food chains are where you take a piece of food, for example onion rings, and link each one to the next creating a long food chain! Seriously though, a food chain is actually just a restaurant company that has multiple locations. Mostly fast food companies come to mind, like McDonald’s, Burger King or Wendy’s. However, they could be finer restaurants like Olive Garden and Sizzler. As long as they are popular and have multiple locations, making a chain of restaurants.