Essentially, not very much. A bistro is a type of restaurant and is just further defined as smaller and more casual than a fine dining establishment. Often, a bistro is described as more of a neighborhood restaurant with community ties, and a warm, cozy, inviting atmosphere.

A bistro is a casual restaurant that originated in France and is known for its focus on traditional French cuisine. Unlike a formal French restaurant, a bistro has a more relaxed ambiance and may offer a limited menu of classic, usually French-influenced dishes.

A bistro is primarily concerned with the dining experience above the drinking experience. Even if bistros serve drinks and small meals together, the food and calm atmosphere will always be prioritized. A bar is a great place for a beer, mocktail, or even a simple well drink with friends.