Bioluminescent organisms are living beings that produce light through chemical reactions within their bodies. This phenomenon is commonly found in various species, including certain types of jellyfish, fireflies, and deep-sea fish. The light is typically used for communication, attracting mates, or deterring predators. The light produced by these organisms can vary in color, often appearing blue or green due to the specific chemicals involved. Bioluminescence is a fascinating adaptation that helps organisms survive in their environments, particularly in dark habitats like the deep ocean, where sunlight does not penetrate.