Similarities and differences among hotels, restaurants and hotels

The similarity is that all three have places to eat, haha. So the difference is that, obviously, restaurants are just places to eat and hotels are also places to stay. Although some hotels have small restaurants, they are only "some". What's more, the dishes are almost monotonous. And if the hotel is a star-rated hotel, you can top hotels and guesthouses. I didn't say which is the most important, room or restaurant, because they are equal.