Nuxt is a server side rendering framework built on top of Vue.
You might think 'but Vue is a framework, why a framework for a framework?'
Enter Server Side Rendering (SSR). SSR enables us to render our content on the fly before it hits the browser. When a user and / or crawler hits a server side rendered web application url, the server sends a fully rendered page the first time, subsequent navigation is done on the client as with regular SPAs.
This has lots of advantages and disadvantages.
Here from the Vue Docs:
Better SEO, as the search engine crawlers will directly see the fully rendered page.
Development constraints. Browser-specific code can only be used inside certain lifecycle hooks; some external libraries may need special treatment to be able to run in a server-rendered app.
More involved build setup and deployment requirements. Unlike a fully static SPA that can be deployed on any static file server, a server-rendered app requires an environment where a Node.js server can run.
More server-side load. Rendering a full app in Node.js is obviously going to be more CPU-intensive than just serving static files, so if you expect high traffic, be prepared for corresponding server load and wisely employ caching strategies.
If a Server Side Rendered Vue App serves your purpose Nuxt makes this a breeze.
Nuxt makes the whole process as simple as possible. You only need to run 'npx create-nuxt-app' and you have a SSR app ready.
Nuxt introduces a folder structure that makes it easy to work with it. Your pages are stored in a pages folder and Nuxt adds them to the router automatically.
Your plugins are contained in a plugins folder and are run before Vue is booted.
There is a huge community around it and lots of modules to handle most of the everyday problems.