ReactJS is an open-source JavaScript library that is used for building user interfaces. It was created by Facebook and released in 2013. ReactJS allows developers to build large, complex web applications that can be updated and rendered efficiently.
One of the key features of ReactJS is its use of a virtual DOM (Document Object Model). The virtual DOM is a lightweight representation of the actual DOM, and React uses it to quickly update and render changes to the user interface without reloading the entire page. This makes React very fast and efficient.
ReactJS is also component-based, which means that developers can create reusable components that can be used across different parts of the application. This helps to simplify the code and makes it easier to maintain.
