Hard cheeses are aged cheeses that have a firm texture and low moisture content. They are typically made from cow's, goat's, or sheep's milk and undergo a longer aging process, which enhances their flavor and makes them easier to grate. Common examples include Parmesan, Pecorino, and Grana Padano. These cheeses are often used in cooking, as they melt well and add depth to dishes. They can also be enjoyed on cheese boards or paired with fruits and nuts. Hard cheeses are rich in protein and calcium, making them a nutritious choice for many diets.