A taco is a traditional Mexican dish consisting of a small hand-sized corn- or wheat-based tortilla topped with a filling. The tortilla is then folded around the filling and eaten by hand. A taco can be made with a variety of fillings, including beef, pork, chicken, seafood, beans, vegetables, and cheese, and garnished with various condiments, such as salsa, guacamole, or sour cream, and vegetables, such as lettuce, onion, tomatoes, and chiles. Tacos are a common form of antojitos, or Mexican street food, which have spread around the world.

A taco stand or taquería is a food stall, food cart or restaurant that specializes in tacos and other Mexican dishes. The food is typically prepared quickly and tends to be inexpensive. Many various ingredients may be used, and various taco styles may be served. Taco stands are an integral part of Mexican street food. Tacos became a part of traditional Mexican cuisine in the early 20th century, beginning in Mexico City, as what had been a miner's snack began to be sold on street corners in the city. Shops selling tacos have since proliferated throughout Mexico and other areas with a heavy Mexican culinary and cultural influence, including much of the Western United States and most other larger American cities. More typical taquerías specialize in tacos, as expected, but in some localities it can be used to refer to restaurants specializing in burritos, where tacos themselves are less of a point of emphasis.