Tectonic boundaries are the edges where two tectonic plates meet. These plates are large sections of the Earth's crust that float on the semi-fluid mantle beneath them. There are three main types of tectonic boundaries: convergent, divergent, and transform. Each type is characterized by different movements and interactions between the plates, leading to various geological features and events. At convergent boundaries, plates push against each other, often causing mountains or earthquakes. Divergent boundaries occur when plates move apart, creating new crust, like at mid-ocean ridges. Transform boundaries involve plates sliding past one another, which can also result in earthquakes. Understanding these boundaries helps explain many geological processes on Earth.