There are several types of wavelengths in the electromagnetic spectrum. These include radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. Each of these wavelengths corresponds to a different range of frequencies and energies. For example, radio waves have long wavelengths and low frequencies, while gamma rays have short wavelengths and high frequencies. These different types of wavelengths have various applications in communication, imaging, and scientific research.