Transform plate boundaries occur where two tectonic plates slide past each other horizontally. This movement can cause earthquakes as the plates get stuck due to friction and then suddenly release. The most famous example of a transform boundary is the San Andreas Fault in California. At transform boundaries, there is no creation or destruction of the Earth's crust, unlike at divergent or convergent boundaries. Instead, the interaction between the plates can lead to the formation of features like linear valleys or offset streams. These boundaries play a significant role in the geological activity of the Earth.