The term 'Tortilla, to a Burrito' can be solved by the four-letter word 'WRAP'. A tortilla is a thin, flatbread made from corn or wheat flour that is popular in Mexican cuisine. It is often used as a WRAP for burritos, which are a type of Mexican dish consisting of a flour tortilla filled with a variety of ingredients such as beans, cheese, and meat. The tortilla is then wrapped around the filling to form a burrito.