At its core, Relay is a JavaScript framework that allows developers to build data-driven applications seamlessly. It works in conjunction with GraphQL, which is a query language for APIs. The synergy between Relay and GraphQL enables developers to fetch and manage data efficiently, ultimately leading to improved user experiences. Relay components play a critical role in this ecosystem by providing a way to declare data dependencies directly within React components.

    Component-Level Data Declarations

    One of the standout features of Relay components is their ability to declare data requirements at the component level. This means that each component can specify precisely what data it needs. This localized data requirement promotes modularity and reusability of components. Rather than relying on a centralized store or global state management, Relay allows components to encapsulate their data logic, making them easier to understand and maintain.