A Van de Graaff Generator is a device that generates high voltages using a moving belt to transfer electric charge. It consists of a large metal sphere mounted on an insulating column, where the belt carries electrons from the base to the top. This process creates a significant electric potential, which can be demonstrated through sparks or by attracting small objects. These generators are commonly used in educational settings and scientific research to study electricity and static electricity. They can produce voltages in the millions of volts, making them useful for experiments in particle physics and other fields that require high-energy particles.