Enzymatic assays are laboratory techniques used to measure the activity of enzymes, which are proteins that catalyze biochemical reactions. These assays typically involve a substrate that the enzyme acts upon, producing a measurable product. By monitoring the rate of product formation or substrate consumption, researchers can determine the enzyme's activity under various conditions. These assays are essential in fields like biochemistry and pharmacology, as they help in understanding enzyme kinetics and the effects of inhibitors or activators. Common applications include drug development and disease diagnosis, where specific enzyme levels can indicate health conditions, such as liver function or metabolic disorders.