Protein is a vital macronutrient made up of amino acids, which are the building blocks of the body. It plays a crucial role in building and repairing tissues, producing enzymes and hormones, and supporting immune function. Foods rich in protein include meat, fish, eggs, dairy, legumes, and nuts. The body requires different types of proteins, categorized as complete or incomplete. Complete proteins, found in animal products, contain all essential amino acids, while incomplete proteins, typically from plant sources, may lack one or more essential amino acids. Consuming a variety of protein sources ensures adequate intake for overall health.