Glycosylases (EC 3.2) are enzymes that hydrolyze glycosyl compounds.
[1] They are a type of hydrolase (EC 3).
In turn, glycosylases are divided into two groups: glycosidases—enzymes that hydrolyze O- and S-glycosyl compounds (EC 3.2.1) -- and enzymes that hydrolyze N-glycosyl compounds (EC 3.2.2).