Enzyme-based therapies leverage the catalytic properties of enzymes to treat diseases. Enzymes are biological catalysts that facilitate biochemical reactions in the body. In therapeutic settings, enzymes can be used to replace deficient or dysfunctional enzymes in patients, a strategy known as enzyme replacement therapy (ERT). For example, ERT is used to treat conditions like Gaucher's disease and Fabry disease by supplying the missing enzyme to the patient's body.