The type of electromagnetic radiation with the shortest wavelength is gamma rays. These high-energy waves are found at the extreme end of the electromagnetic spectrum, beyond X-rays. Gamma rays have wavelengths less than 0.01 nanometers, making them significantly shorter than those of visible light and other forms of radiation. Due to their short wavelengths, gamma rays carry considerable energy and are capable of penetrating most materials. They are commonly produced in nuclear reactions and certain astrophysical processes, playing essential roles in medical imaging and radiation therapies.