The IUPAC system of enzyme classification provides a standardized framework for naming and categorizing enzymes based on the chemical reactions they catalyze rather than their source or structure. Enzymes are biological catalysts that accelerate specific biochemical reactions, and the International Union of Pure and Applied Chemistry (IUPAC), in collaboration with the International Union of Biochemistry and Molecular Biology (IUBMB), established a systematic classification to facilitate clear communication among researchers and to avoid confusion caused by multiple names for the same enzyme. In this system, enzymes are assigned an Enzyme Commission (EC) number, which is a numerical identifier consisting of four parts separated by periods. Each part of the EC number provides hierarchical information about the enzyme’s function. The first digit represents the main class of the enzyme based on the type of reaction it catalyzes. There are six major classes: oxidoreductases, transferases, hydrolases, lyases, isomerases, and ligases. Oxidoreductases (EC 1) catalyze oxidation-reduction reactions involving the transfer of electrons. Transferases (EC 2) move a functional group, such as a methyl or phosphate group, from one molecule to another. Hydrolases (EC 3)