The cheese that is used in Tacos is often Cheddar Cheese.
However other cheeses are also used in some tacos depending on the flavor profile you want.
Other good cheeses besides cheddar cheese that are great in tacos are cotija cheese, queso asadero cheese, queso Oaxaca cheese, queso fresco cheese and Monterey Jack cheese.
Besides cheddar cheese the other most common cheese used on tacos is Cotija Cheese.
Cotija cheese is a crumbly, salty Mexican Cheese which adds a strong flavor profile to tacos without it melting too much.
This makes Cotija cheese ideal to use as a topping for tacos.
Queso Fresco is also another popular cheese for tacos and is mild, fresh and crumbly and Queso Oaxac is stringy and melty and is similar to mozzarella depending on your desired taste and texture.
Most Mexican restaurants use Queso asadero cheese to melt for foods they make and serve.
Queso asadero is a Mexican cheese which is great for melting and it's soft, creamy and white and has a mild taste and is often also used to make quesadillas, queso fundido and even pizzas.