Nachos are a popular food based on nixtamalized corn, of Mexican origin associated with Tex-Mex cuisine that can be either made quickly to serve as a snack or prepared with more ingredients to make a full meal. In Mexico itself they are rather called "totopos". In their simplest form, nachos are tortilla chips (totopos) covered in nacho cheese or shredded cheese and/or salsa. Sometimes french fries, potato chips or popcorn is used instead of tortilla chips. First created circa 1943 by Ignacio "Nacho" Anaya, the original nachos consisted of fried corn tortillas covered with melted cheddar cheese and pickled jalapeño peppers.

Not Another Completely Heuristic Operating System, or Nachos, is instructional software for teaching undergraduate, and potentially graduate level operating systems courses. It was developed at the University of California, Berkeley, designed by Thomas Anderson, and is used by numerous schools.