Cheddar sauce, cheddar cheese sauce or simply cheese sauce (in the UK) is a traditional sauce used in English cooking. The sauce is based upon white sauce, which is known as one of the 'mother sauces', and cheddar cheese. Nachos are a dish from northern Mexico. The dish is composed of tortilla chips (totopos) covered with cheese or cheese-based sauce, and is often served as a snack. First created in about 1943 by Ignacio "Nacho" Anaya, the original nachos consisted of fried corn tortillas covered with cheddar cheese and sliced jalapeño peppers. This cheese sauce got very popular all over the world and famous as Nacho Cheese sauce.
Salsa is the Italian and Spanish term for sauce, and in English-speaking countries usually refers to the sauces typical of Mexican cuisine known as salsas picantes, particularly those used as dips. Salsa is often a tomato-based sauce or dip that is a heterogeneous mixture that includes additional ingredients such as onions, chilies, beans, corn, and various spices. It is typically piquant, ranging from mild to extremely hot.