Religion is a social institution found in all societies that helps explain life's mysteries and provide meaning and purpose. While religions vary in beliefs and practices across places and times, they generally propose sacred explanations for life's questions like what happens after death. Sociologists study how religion impacts society and social institutions, and how society shapes religion. Functionalism views religion as promoting social cohesion by creating a community and shared values, while Marxism sees religion preventing awareness of social inequalities. Individual perspectives emphasize how people construct their own religious beliefs and relationships.