NextJS
NextJS is a framework with a set of libraries that work together to build a web app, and one of those libraries is ReactJS.
Next is a framework for react which is built upon react library.
NextJS, we can build an entire web application.
Next is a famous server-side rendering and static generation of websites
NextJS features include automatic building size optimization, faster developer compilation, a preview mode, static export, and pre-rendering.
Next can be difficult for someone to learn without prior ReactJS knowledge.
The web apps built using NextJS are very fast
NextJS offers better features
ReactJS
React is a JavaScript library that helps you to build user interfaces using components as building blocks.
React is a library, not a framework
ReactJS helps in building the beautiful UI of a web application
React on the other side doesn’t support server-side rendering.
Facebook built on ReactJS, an open-source front-end JavaScript library, in 2012. Web pages and mobile applications commonly use ReactJS for development.
React can be easier to learn as compared to NextJS but you still need to learn vanilla JavaScript
The web apps built using ReactJS are slow as compared to NextJS
ReactJS offers better developer support.