Structural functionalism is a theory that attempts to explain why society functions the way it does by looking at the relationships between different social institutions. This theory sees society as a complex system with different parts working together to maintain order and stability. One of the key ideas of structural functionalism is that of social equilibrium. This is the idea that society is constantly trying to maintain a balance between different forces. For example, if there is an increase in crime, then there will be a corresponding increase in the number of police officers. This theory views society as a self-regulating system where each part plays a vital role in maintaining the balance. Another key idea of structural functionalism is that of social change. This is the idea that change is essential for the survival of any society. Change is seen as a necessary response to the different challenges that society faces. For example, when there is a change in the economy, this will lead to a change in the structure of society. Structural functionalism is a theory that has been very influential in the field of sociology. It has helped to explain how society functions and how it changes over time.