Plate boundaries are the edges where two tectonic plates meet. These boundaries can be classified into three main types: divergent, convergent, and transform. At divergent boundaries, plates move apart, creating new crust, often seen at mid-ocean ridges. Convergent boundaries occur when plates collide, leading to mountain formation or subduction, where one plate is forced beneath another. Transform boundaries are where plates slide past each other horizontally, causing earthquakes. The movement at these boundaries is driven by the heat from the Earth's interior, which causes convection currents in the mantle. Understanding plate boundaries helps explain geological events and the formation of various landforms.