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Basically React Js is an open-source JavaScript library and it is used for building user interfaces specifically for a single page applications and it is used for handling view layer for web and mobile apps. Also it is enable us to create reusable UI components.
What are the Prerequisites of React Js? For working with ReactJS, you must have a solid knowledge of JavaScript, HTML5, and CSS. Even though ReactJS doesn't use HTML, the JSX is similar so your HTMLknowledge will be very helpful.