Chemiluminescence is the process by which light is produced as a result of a chemical reaction. This phenomenon occurs in various natural and artificial settings, such as in certain types of fireflies and glow sticks. In these cases, specific chemicals react to release energy in the form of light, often without producing significant heat. The light emitted through chemiluminescence can be used in various applications, including scientific research and medical diagnostics. For example, bioluminescent assays utilize this property to detect specific substances in samples, making it a valuable tool in laboratories.