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Enzymes are a group of biocatalysts with protein structure produced from bacteria, yeasts, fungi, plants, and molds, which have received attention in recent years due to their region-, stereo-, and enantioselectivity. Because of these features, enzymes are used in a wide range of organic synthesis interestingly especially in asymmetric synthesis and kinetic resolution to obtain pure enantiomers. All groups of enzymes are produced from renewable raw materials and are biodegradable and exhibit different properties, including stability, activity, and specificity. Biocatalysts present many appealing features in green chemistry and because of the mild operating conditions of enzymatic processes, they can be performed in relatively simple equipment and are easy to control. In the current review, we discuss on the biography and structure of enzymes in general. In addition, the classification of enzymes is reviewed. 

enzymes, biocatalysts, structure of enzymes, classification of enzymes.