GraphOS is a platform that enables the enforcement of GraphQL security best practices at scale. It provides a unified but modular approach to GraphQL, allowing platform teams to block malicious traffic, define security policies, and provide defense in depth. GraphOS can be used to centralize authorization in the router, safelist registered operations, limit operation complexity, learn security best practices at GraphQL summit, and understand GraphQL security. By using GraphOS, platform teams can improve visibility, security, and scalability for their APIs while balancing flexibility with security measures that prevent bad actors from exploiting its self-serve nature.