Cherenkov Radiation is a phenomenon that occurs when a charged particle, such as an electron, travels through a dielectric medium, like water or glass, at a speed greater than the speed of light in that medium. This results in the emission of a faint blue light, which is often observed in nuclear reactors or particle detectors. The effect was first described by Pavel Cherenkov in 1934, leading to significant advancements in particle physics and astrophysics. Cherenkov radiation is utilized in various applications, including Cherenkov detectors, which help identify high-energy particles and study cosmic rays.