Reactjs is a Javascript library used to build powerful Single Page, Progressive Web Applications. It's a really popular tool used for frontend development.
Pros
Reusable Components.
State management.
Hooks.
Custom Library support.
A wide range of third-party modules from npm(node package manager) is available.
A huge and motivated community of developers.
Cons
Client-Side Routing.
Low SEO.
ReactJS Covers only the UI Layers of the app and nothing else.

A huge demand for ReactJS developers in the market.
Facebook, Instagram, Netflix etc use ReactJS.



ReactJS Roadmap(Beginners)

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