Photobiology is a dynamically developing field of knowledge and practical activity. The Russian Photobiological Society promotes the development of creative activity and communication of scientists and practitioners in the field of photobiology and related disciplines. In September 2023, the X Congress of the Russian Photobiological Society took place. The article provides definitions of photobiology, biophotonics, photobiotechnology, and bioluminescence. A brief history of the Russian Photobiological Society is described, as well as an overview of the program and results of the X Congress, including a summary of articles prepared based on the materials of reports at the Congress, the topics closest to biophysics.