Satellite reentry refers to the process of a satellite returning to Earth's atmosphere after its mission is complete. As it descends, the satellite encounters increasing air resistance, which generates intense heat. This heat can reach thousands of degrees Celsius, requiring satellites to be built with protective materials to withstand the extreme conditions. During reentry, most satellites burn up in the atmosphere, but some larger pieces may survive and reach the Earth's surface. To minimize risks, space agencies often plan reentry paths to ensure that any debris falls into uninhabited areas, such as oceans or remote regions, reducing the chance of harm to people or property.