What is X-ray? Md. Saifur Rahman A type of high energy ray that can penetrate through muscles of the body and can create an image on a photographic plate. The nature of this ray was not known then and hence the ray is named X-ray.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?