Bioluminescence refers to the natural ability of certain organisms to produce and emit light. This phenomenon occurs in various species, including certain types of jellyfish, fireflies, and bacteria. Bioluminescence results from chemical reactions involving luciferin (a light-emitting molecule) and the enzyme luciferase. Many organisms use bioluminescence for different purposes, such as attracting mates, deterring predators, or luring prey, showcasing the incredible adaptations that have evolved in various ecosystems.