This document discusses the social dimension of education. It defines education and outlines the four pillars of education according to UNESCO: learning to know, learning to do, learning to live together, and learning to be. The document also examines various philosophies of education including realism, idealism, naturalism, humanism, pragmatism, existentialism, essentialism, progressivism, constructivism, reconstructivism, perennialism, behaviorism, and nationalism.