Which dish is in the picture?
Nachos is a Tex-Mex dish from northern Mexico that consists of heated tortilla chips or totopos covered with melted cheese (or a cheese-based sauce), often served as a snack or appetizer. More elaborate versions of the dish include other ingredients, and may be substantial enough to serve as a main dish. Ignacio "Nacho" Anaya is credited for creating the dish in 1943; the original nachos consisted of fried corn tortilla chips covered with melted cheese and sliced jalapeño peppers.
In the United States, National Nacho Day is celebrated on November 6. The International Nacho Festival is held between October 13 and 15 at Piedras Negras, the birthplace of nachos, and features live music, art, cultural activities, and a "biggest nacho of the world" contest which is registered with the Guinness World Records.