Rayleigh-Taylor instability is a fluid dynamics phenomenon that occurs when a denser fluid overlies a lighter fluid. The instability arises due to the gravitational force acting on the interface between the two fluids, causing instabilities and the formation of characteristic patterns such as mushroom-like structures and fingers. This instability is observed in a wide range of natural and industrial processes, such as cloud formation, astrophysical phenomena, and mixing processes in engineering applications. Understanding and controlling Rayleigh-Taylor instability is important for predicting the behavior of fluid systems and optimizing processes where it may occur. Research in this area focuses on studying the underlying physics of the instability, developing mathematical models to describe its behavior, and finding ways to mitigate its effects.