Non-ionising radiation is a term that refers to types of radiation that do not have enough energy to ionize atoms or molecules. Synonyms for non-ionising radiation can include non-ionizing radiation, low-level radiation, nonparticulate radiation, and non-energetic radiation. These types of radiation are generally considered safe for human exposure, although prolonged exposure to some types may still cause harmful effects. Common sources of non-ionising radiation include visible light, radio waves, microwave radiation and ultraviolet radiation. It is important to understand the different types of radiation and their potential effects on the human body in order to take necessary precautions and protect oneself from harmful radiation.