Queso is a popular cheese sauce that originated in Tex-Mex cuisine, and is traditionally made with a type of cheese called queso blanco. This white cheese is a mild, semi-soft cheese with a crumbly texture, and is commonly used in Mexican and Hispanic cooking. It is made from cow’s milk and has a slightly salty taste that complements the other ingredients in queso, such as tomatoes, onions, garlic, and chilies. Some recipes may also use other types of cheese, such as Cheddar or Monterrey Jack, but queso blanco is the most traditional and authentic choice for making queso.