React is one of the members of the ME'R'N stack which is used to develope a full stack web-application. Here, it provides the Frontend of the website 🫡
It helps in creating single-page applications (those applications in which on the request of the client, the server provides HTML, CSS and JS, but eventually the JS takes charge over HTML and CSS. This allows seemless experience because it does not require to reload the page 🫨).