Earth has 7 major plate tectonic boundaries and 10 or so minor ones.
Each tectonic plate boundary can interact with each other in 3 ways:
- Divergent plates pull apart from each other
- Convergent plates push plates together
- And conservative (transform) plate boundaries slide across from each other
For example, the San Andreas fault is between the North American plate and Pacific plate. While the North American plate in the east moves in the southwest direction, the Pacific plate in the west moves northwest.
Transform plates are neither convergent or divergent. For example, the Scotia Plate is surrounded by two major plates. But its neighboring plates controls how much it moves in either direction.