X-Rays are a form of electromagnetic waves that are transmitted in waves or particles, which are at different wavelengths. They also have different frequencies which is known as the electromagnetic spectrum, which is a broad range of wavelengths. The ER spectrum is divided into seven regions, radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. The spectrum is ordered by decreasing wavelength and increasing energy and frequency. Inside of the seven groups, x-rays is also classified into two smaller groups, soft x-rays and hard x-rays. Soft x-rays are between ultraviolet rays and the gamma rays. The location causes it to have a significantly higher frequency than hard x-rays. Hard x-rays occupy the same region as gamma rays. One large difference between hard x-rays and gamma rays is their source. X-rays are produced by electrons that are accelerating and gamma-rays are made by atomic nuclei.