1. McDonald's

McDonald's is the world's largest restaurant chain by revenue, serving over 69 million customers daily in 119 countries across approximately 39,000 outlets.

2. Wendy's

Wendy's is an American international fast food restaurant chain founded by Dave Thomas on November 15, 1969, in Columbus, Ohio.

3. Starbucks

Starbucks is the world's largest coffeehouse chain, with more than 30,000 locations around the world.

4. Taco Bell

Taco Bell is an American chain of fast food restaurants specializing in Mexican-inspired food.

5. Burger King

Burger King is an American multinational chain of hamburger fast food restaurants.

6. Domino's Pizza

Domino's Pizza is an American multinational pizza restaurant chain with more than 17,000 locations around the world.

7. Dunkin'

Dunkin' (formerly known as Dunkin' Donuts) is an American multinational coffeehouse and donut company with over 12,000 locations worldwide.

8. Pizza Hut

Pizza Hut is an American restaurant chain and international franchise known for its Italian-American cuisine, including pizza and pasta, as well as side dishes and desserts.

9. KFC

KFC is an American fast food restaurant chain that specializes in fried chicken.

10. Subway

Subway is the world's largest submarine sandwich chain, with more than 40,000 locations around the world.