The primary driver of tectonic plate movement is the heat generated from the Earth's interior, which causes convection currents in the mantle. These currents create forces that push and pull the plates of the Earth's crust. Additionally, processes such as subduction and seafloor spreading contribute to the movement of these plates. Tectonic plate movement leads to geological phenomena like earthquakes, volcanoes, and the formation of mountains, significantly impacting the planet's landscape.