App Building & Devintermediate
React
Definition
A JavaScript library created by Meta for building user interfaces. The most widely used frontend technology. It breaks UIs into reusable components that update dynamically.
Why it matters
Most modern web apps and SaaS products are built with React or React-based frameworks. Understanding it helps you work with developers, read code, and make informed tech decisions.
Example
A founder's dashboard is built in React. Each section (revenue chart, task list, notifications) is a separate component, easy to update or redesign independently.
Related terms
Learn the language of business - and build the systems behind it.
Rich Girl Systems turns 1168+ founder concepts into a step-by-step programme with daily challenges, XP and your own assistant.
Take the free founder quiz