Compton Scattering is a phenomenon that occurs when X-rays or gamma rays collide with electrons in matter. During this interaction, the incoming photon transfers some of its energy to the electron, causing the electron to recoil and the photon to lose energy. As a result, the scattered photon has a longer wavelength than the original, which is known as the Compton wavelength shift. This effect was first observed by physicist Arthur H. Compton in 1923, providing evidence for the particle-like behavior of light. Compton Scattering is significant in fields like astrophysics and medical imaging, as it helps scientists understand the behavior of high-energy photons in various materials.