Whey is a byproduct of cheese production, formed when milk is curdled and strained. It is a liquid that contains proteins, lactose, vitamins, and minerals. Whey is often processed into a powder form, known as whey protein, which is popular among athletes and fitness enthusiasts for its high protein content and quick absorption. Whey protein is available in several types, including whey protein concentrate, whey protein isolate, and whey protein hydrolysate. Each type varies in protein content and processing methods. Due to its nutritional benefits, whey is commonly used in protein shakes, bars, and various food products to enhance protein intake.