It's essential to maintain a consistent and dependable energy supply given the rising global demand for energy. When there is a crisis, such as a malfunction or an imbalance between energy production and load demand, the frequency system becomes unstable. A load shedding scheme is an important key to recover frequency system and ensure the obtainability of electrical power for serious loads in a plant. Therefore, it is necessary to provide reliable technologies to quickly and accurately prevent breakdown in the system energy. UFLS is one of the important systems protection, and as is currently the case in many instances, it is the final step to prevent the system's collapse following an interruption or failure energy in the system. The review of the literature is presented, along with a look at the various methods employed in the electrical power system and a comparison of traditional, adaptive, and intelligent load-shedding strategies. In order to clarify the intended function (entity) and preserve system stability, extra classification of additional elements is suggested. The various load shedding systems were addressed, along with their benefits and drawbacks, and a comparison between them was made with a list of the most significant justifications for doing so.