Hydrolases are a class of enzymes that catalyze the breakdown of various compounds by adding water, a process known as hydrolysis. They play a crucial role in many biological processes, including digestion and metabolism, by helping to break down complex molecules like proteins, fats, and carbohydrates into simpler forms that the body can use. These enzymes are categorized based on the type of bond they cleave, such as proteases for proteins, lipases for fats, and amylases for carbohydrates. Hydrolases are essential for maintaining cellular functions and are found in various organisms, from bacteria to humans.