Fluorescent proteins are proteins that emit light when exposed to specific wavelengths of light. They are commonly found in certain marine organisms, such as jellyfish and coral. These proteins have become essential tools in biological research, allowing scientists to visualize and track cellular processes in real time. One of the most well-known fluorescent proteins is Green Fluorescent Protein (GFP), originally discovered in Aequorea victoria, a species of jellyfish. Researchers have engineered various variants of GFP and other fluorescent proteins to emit different colors, enabling multi-color imaging in live cells and organisms, which enhances our understanding of complex biological systems.