There are three main types of plate boundaries: divergent boundaries, transform boundaries, and convergent boundaries. Divergent boundaries occur where plates move apart, and can be oceanic or continental in nature. Transform boundaries occur where plates slide past one another. Convergent boundaries occur where plates collide, and can involve continental-continental, oceanic-continental, or oceanic-oceanic collisions. These boundaries result in different geological features like mid-ocean ridges, rift valleys, subduction zones, and mountain ranges.