Relay

Lesson in the React Roadmap · Stage 10: API Calls

Last updated 14 September 2026

What is Relay?

Relay is a JavaScript client used in the browser to fetch GraphQL data. It's a JavaScript framework developed by Facebook for managing and fetching data in React applications. It is built with scalability in mind in order to power complex applications like Facebook. The ultimate goal of GraphQL and Relay is to deliver instant UI-response interactions.

Study this in the interactive course See the whole React roadmap

Free resources to learn Relay

Official docsOfficial Website
Official docsIntroduction to Relay modern

Relay: common questions

Can I learn Relay in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Relay in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Relay tutorial for beginners?

It is lesson 48 of 79 in the free React roadmap, in stage 10, API Calls. If you are new to React, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.