Proteins are essential macromolecules made up of long chains of amino acids. They play a crucial role in the body, serving as building blocks for tissues, enzymes, and hormones. Each protein has a unique structure that determines its specific function, making them vital for processes such as metabolism and immune response. In addition to their structural roles, proteins are involved in various biological activities, including catalyzing biochemical reactions and transporting molecules across cell membranes. The diversity of proteins is immense, with thousands of different types found in living organisms, each tailored to perform specific tasks critical for life.