Fats and oils are essential macronutrients that provide energy and support cell growth. They play a crucial role in absorbing vitamins A, D, E, and K, which are vital for various bodily functions. Fats can be classified into saturated, unsaturated, and trans fats, each having different effects on health. In cooking, oils are often used for frying, baking, and dressing salads. Common sources of fats include butter, olive oil, and avocado. While fats are necessary for a balanced diet, it's important to consume them in moderation to maintain overall health and prevent chronic diseases.