This introduction aims to present sociology from the very beginning. Sociology deals with society as a product of social action. It starts with the concept of social action and focuses on society. This introduction attempts to systematically explore this path with some fundamental concepts. If social action is the starting point of sociology, then it is necessary to determine how people come together to act in society. The answer is that social order brings people together as a society and distinguishes them from others. With the variety of purposes that people can discover and pursue within a social order, it will become differentiated. The fact of social differentiation raises the corresponding issue of social integration. When a society has differentiated and becomes more or less complex, the question arises of how the various parts of society remain connected to one another.