Curd is a dairy product made by coagulating milk, which involves the process of curdling. This is typically achieved by adding an acid, such as lemon juice or vinegar, or by using a starter culture containing lactic acid bacteria. The result is a thickened substance that can be used in various culinary applications. Curd is rich in protein, calcium, and probiotics, making it a nutritious addition to many diets. It is commonly used in dishes like yogurt, cheese, and paneer, and can also be enjoyed on its own or as a base for sauces and dressings.