Singlet oxygen is a highly reactive form of oxygen that plays a key role in a variety of biological and chemical processes. It is produced through the interaction of oxygen molecules with various sources of energy, such as light or heat. Singlet oxygen is involved in a range of important biological processes, including photosynthesis and the immune response. Researchers are studying the properties and behavior of singlet oxygen in order to better understand its role in these processes and to develop new therapeutic approaches for a variety of health conditions, including cancer and cardiovascular disease.