Yeast extract is a natural, rich concentrate of flavor and nutrients obtained by controlling the degradation of proteins, nucleic acids, and other components within yeast cells through autolysis or enzymatic hydrolysis, using edible yeast (such as brewer's yeast) as raw material, and then separating the cell walls. It is not a single compound, but a complex natural food base rich in amino acids, peptides, nucleotides, B vitamins, and minerals, and is renowned for its rich, meaty flavor and smooth texture.