Does only visible light show diffraction?

No, diffraction is not limited to visible light; it occurs with all types of waves, including sound waves, water waves, and electromagnetic waves across the entire spectrum, such as radio waves and X-rays. Diffraction happens when waves encounter an obstacle or aperture that is comparable in size to their wavelength, causing them to bend and spread out. This phenomenon can be observed in various contexts, illustrating the wave nature of different types of radiation.