Answer:
There are numerous and varied causes of social change. Four common causes, as recognized by social scientists, are technology, social institutions, population, and the environment. All four of these areas can impact when and how society changes.
Well known examples of such change have resulted from social movements in civil rights, women's rights, and LBGTQ rights, to name just a few. Relationships have changed, institutions have changed, and cultural norms have changed as a result of these social change movements. That's pretty heady stuff.