structural functionalism or simply functionalism is a framework for building theory that sees society as a complex system whose parts work together to promote solidarity and stability. society is a changing matter because every person has there own opinion about things. think about it, its like a group decision and take 20 people for example. 3 of them might disagree and 2 out of them 3 might agree with each other. the idea or opinion with the most people whom agree with it/ and or about it basically that's what society goes with weather you agree or not. And as people grow up there opinions and outlooks of things will grow and change and be different. one thing you need to remember with history is that there is only one thing in the whole world that stays the same no matter what, and that is EVERYTHING changes. think about it.
I hope this helped!!
