Lyases are a type of enzyme that catalyze the breaking of chemical bonds in molecules without the addition of water, which distinguishes them from hydrolases. They often create double bonds or rings in the process. Lyases play a crucial role in various metabolic pathways, helping to facilitate reactions that are essential for cellular function. These enzymes can also reverse their reactions, forming new bonds and producing different molecules. For example, decarboxylases are a specific type of lyase that remove a carboxyl group from a substrate, releasing carbon dioxide. Overall, lyases are vital for maintaining the balance of biochemical processes in living organisms.