Photobiological Sciences Online (PSO) is an educational platform established by the American Society for Photobiology that serves as a vital resource for understanding photobiology—the study of biological phenomena that involve non-ionizing radiation. PSO aims to promote the knowledge of photobiological processes, which encompass areas such as environmental photobiology, photochemistry, photomedicine, and light-induced biological responses.

The site offers numerous modules that delve into topics including photosynthesis, bioluminescence, UV radiation, and non-visual photoreception, providing insights into both the beneficial and harmful effects of light on biological systems. It also features educational resources such as experiments for students, suggested readings, and animations that enhance learning. PSO continually evolves, adding new content based on user feedback and scientific advancements. By joining PSO, individuals can stay informed about current research and developments in photobiology, supporting the broader mission of the American Society for Photobiology to advance knowledge and application in this essential field.