Popular fast-food chains Arby's and KFC are two of the most well-known fast-food restaurants in the United States. Arby's is a fast-food sandwich restaurant chain with over 3, 400 locations in the US and Canada. KFC, formerly known as Kentucky Fried Chicken, is an American fast-food restaurant chain that specializes in fried chicken. Both Arby's and KFC have been around for decades and are popular choices for quick meals.