What region of the earth allows for the movement of tectonic plates?

The movement of tectonic plates occurs in the Earth's lithosphere, which is the rigid outer layer of the Earth composed of the crust and the upper mantle. This movement is driven by convection currents in the underlying, more fluid asthenosphere. The boundaries between tectonic plates can be divergent, convergent, or transform, where the interactions can lead to geological phenomena such as earthquakes, volcanic activity, and the formation of mountains.