Queso Oaxaca refers to a fairly fresh, string cheese which is a product of the hills of that state in southern Mexico. It is a Mexican cheese similar to Mozzarella. Moreover, Queso Oaxaca is also known as Quesillo, this is by far the most popular cheese for making Quesadillas. It is a stretched curd cheese, kneaded and wound into balls. It should be pulled apart into thin strings before using to fill tortillas or melted on cooked food. Mozzarella or string cheese can be used in its place