An X-ray, or 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 30 petahertz to 30 exahertz and energies in the range 124 eV to 124 keV.
X-rays are a type of radiation called electromagnetic waves. X-ray imaging is used to create pictures of the inside of the body. The images show the parts of the body in different shades. This is because different tissues absorb different amounts of radiation. X-ray scans are used in diagnostic devices to identify or prevent fractures or conditions such a cancer, infections, etc.