Protein powder is a dietary supplement made from various protein sources, such as whey, casein, soy, or pea. It is commonly used by athletes and fitness enthusiasts to help meet their daily protein needs, support muscle growth, and aid in recovery after exercise. Typically available in powder form, it can be mixed with water, milk, or added to smoothies and recipes. Protein powder comes in various flavors and formulations, making it a convenient option for those looking to increase their protein intake without consuming whole foods.