Goat cheese has been made for thousands of years, and was probably one of the earliest made dairy products. In the most simple form, goat cheese is made by allowing raw milk to naturally curdle, and then draining and pressing the curds. Other techniques use an acid (such as vinegar or lemon juice) or rennet to coagulate the milk. Soft goat cheeses are made in kitchens all over the world, with cooks hanging bundles of cheesecloth filled with curds up in the warm kitchen for several days to drain and cure. If the cheese is to be aged, it is often brined so that it will form a rind, and then stored in a cool cheese cave for several months to cure.