The main ingredient in cheese is milk. Cheese is produced through the coagulation of milk proteins, primarily casein, which is achieved through the addition of rennet and/or acids. The type of milk used can vary, including cow's, goat's, or sheep's milk, and affects the cheese's flavor, texture, and characteristics. The process of making cheese involves several steps, including curdling, draining whey, and aging, which allows flavors to develop and the cheese to mature. Different types of cheese originate from various regions and cultures, contributing to a wide range of varieties enjoyed around the world today.