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. Bioluminescent organisms use this light for various purposes, such as attracting mates, deterring predators, or luring prey. In some cases, like in glow-in-the-dark algae, the light can create stunning visual displays in oceans, especially at night. This unique ability has fascinated scientists and nature enthusiasts alike.