Gamma rays are a form of electromagnetic radiation that are produced by radioactive decay and nuclear explosions. They have the smallest wavelength and the highest frequency of any type of electromagnetic radiation. Gamma rays can be described by several synonyms, including gamma radiation, gamma beams, gamma rays, and gamma waves. They are often referred to as electromagnetic radiation due to their ability to travel through space, but also have characteristics of both particles and waves. The energy of gamma rays can be used for various purposes including medical imaging and cancer treatment. Despite their benefits, exposure to gamma radiation can also cause harmful effects on human health.