An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range of 30 petahertz to 30 exahertz and energies in the range of 124 eV to 124 keV. X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. The most familiar use of X-rays is checking for fractures (broken bones), but X-rays are also used in other ways.