Here's a breakdown:

* Tectonic plates are the massive, irregularly shaped slabs of the Earth's lithosphere (the rigid outer layer).

* Continental plates are the tectonic plates that form the continents. They are primarily made up of granite and other lighter, less dense rocks.

* Oceanic plates are the tectonic plates that form the ocean floor. They are primarily made up of basalt, a denser rock than granite.

It's important to note that sometimes a plate can be both continental and oceanic. For example, the North American Plate includes both the continent of North America and parts of the ocean floor.