React JS is used for different purposes by different companies. I have listed a few top companies how they use React JS:
- Facebook uses React for its webpage and its mobile app is built using React version called React Native.
- Instagram uses React for its features like geolocations, Google Map APIs, search engine accuracy.
- Netflix uses React JS for factors like startup speed, runtime performance, and modularity.
- WhatsApp also uses React JS for their WhatsApp web application
I suggest this Website development course by Intellipaat in case you want to learn Website development
You can watch this video on React JS course for beginners to know about uses of React JS: