Bioluminescent organisms are living creatures that produce light through chemical reactions within their bodies. This phenomenon is found in various species, including certain types of jellyfish, fireflies, and deep-sea fish. The light can serve different purposes, such as attracting mates, deterring predators, or luring prey. The light produced by these organisms is typically blue or green, as these colors travel best through water. Bioluminescence is a result of a reaction between a light-emitting molecule called luciferin and an enzyme known as luciferase. This unique ability makes bioluminescent organisms fascinating subjects for scientific research and exploration.