A plate boundary is a region where two tectonic plates meet. These plates are large sections of the Earth's lithosphere that move and interact with each other. There are three main types of plate boundaries: divergent, convergent, and transform. Each type is characterized by different geological activities, such as earthquakes, volcanic eruptions, and the formation of mountains. At divergent boundaries, plates move apart, creating new crust as magma rises. Convergent boundaries occur when plates collide, often leading to one plate being forced beneath another, a process known as subduction. Transform boundaries involve plates sliding past each other, which can cause significant seismic activity. Understanding these boundaries helps scientists predict geological events.