Answer: Most enzymes fall into hydrolases.
Hydrolases represent a enzyme group with large number of enzymes. They are hydrolytic enzymes which use water to cleave chemical bonds , usually divides the large molecule into small molecules. Classification of these enzymes are generally done first by the nature of bond being hydrolysed, then the nature of substrate formed. Example of common hydrolases include esterases, proteases, glycosidases, nucleosidases and lipases. These enzymes are required for various metabolic processes in living beings hence they are large in number.