The Apollo router is a software component that replaces the GraphQL Gateway and is implemented using the RUST programming language. It offers a highly configurable, loosely coupled, and high-performance routing solution for self-hosted graphs. The Apollo router enables developers to easily manage and route queries between different GraphQL services within an organization. It provides flexibility in configuration and has a low overhead, resulting in faster response times and improved performance.
In addition to the Apollo router, Apollo Federation is an open architecture that combines multiple GraphQL APIs into a single graph. It enables developers to break up a monolithic GraphQL schema into smaller, independently deployable services, which can then be combined into a single, unified graph. With Apollo Federation, developers can build scalable, modular GraphQL APIs that can be easily maintained and extended over time. The result is a more flexible and agile approach to building GraphQL APIs that can adapt to changing business needs and requirements.