Bioluminescence is the natural phenomenon where living organisms produce light through chemical reactions within their bodies. This light is often seen in various species, including certain types of jellyfish, fireflies, and deep-sea fish. The process typically involves a light-emitting molecule called luciferin and an enzyme called luciferase, which together create a glow when they react with oxygen. Bioluminescence serves various purposes in nature, such as attracting mates, deterring predators, or luring prey. For example, fireflies use their light to communicate and attract partners, while some deep-sea creatures use it to camouflage themselves or to attract food in the dark ocean depths.