A transform boundary, also known as a transform fault, is a type of fault along a plate boundary where the motion is predominantly horizontal. It is a special case of a strike-slip fault that forms a plate boundary. Transform boundaries are characterized by the lateral offset between segments of divergent boundaries, forming a zigzag pattern. They involve no addition or loss of lithosphere at the Earth's surface and are known as conservative plate boundaries. Most transform boundaries are found in oceanic crust, where they accommodate the lateral motion between tectonic plates, but a smaller number are found on land, such as the San Andreas Fault and the Alpine Fault