What is the role and value of public policy?

How does public policy affect our everyday lives? What is the role and value of public policy? Think about what you eat, what you learn in school, what kind of transportation you use, how to access and pay for health care, what you listen to on the radio or watch on TV or see on social media, how you engage in hobbies, etc. Do you see these policies as protective? Restrictive? Something else?