Cheddar cheese is a semi-firm cow's milk cheese. In Australia, it is called tasty cheese. Cheddar is among the most popular cheeses in the world, representing the second-most popular cheese in the United States (after mozzarella) and the most popular cheese in the United Kingdom.
Cheddar cheese derives its name from the cheddaring process, in which the cheese curd is cut into slabs and stacked in order to expel whey and promote acidity. This step gives cheddar its distinctive flavor and crumbly texture.