what are transform boundaries? what are their effects?

Brief Explanations:

Transform boundaries are where two tectonic plates slide past each other horizontally. Their main effect is frequent earthquakes as stress builds up and is released. There is usually little volcanic activity as the plates don't create or destroy crust in the same way as other boundaries.

Answer:

Transform boundaries are the locations where two tectonic plates slide horizontally past one another. Their effects mainly include frequent earthquake - occurrences due to stress - release as the plates move, and generally low volcanic activity.