Essential Amino Acids are a group of nine amino acids that are essential for human health. They are not produced by the body and must be obtained through diet or supplementation. These nine amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. They are important for growth and development, tissue repair, and the production of hormones and enzymes.