How does a transform boundary change the movement of tectonic plates before and after its formation?

A transform boundary is a type of plate boundary where tectonic plates slide past each other horizontally. Before the formation of a transform boundary, the movement of tectonic plates may have been different, such as moving towards each other at a convergent boundary or moving apart at a divergent boundary. After the formation of a transform boundary, the movement of tectonic plates changes to sliding past each other horizontally, which can cause earthquakes and create new geological features.