A burrito in Mexico is, historically, a regional name, among others, for what is known as a taco, a tortilla filled with food, in other parts of the country. The tortilla is sometimes lightly grilled or steamed to soften it, make it more pliable, and allow it to adhere to itself. Burritos are often eaten by hand, as their tight wrapping keeps the ingredients together. Burritos can also be served "wet", i.e., covered in a savory and spicy sauce, when they would be eaten with a fork and knife.

Source: Wikipedia