Nuxt.js is a popular server-side rendering (SSR) framework built on top of Vue.js.It follows a specific directory structure, such as pages/ for routes, store/ for state management, and plugins/ for Vue.js plugins.Nuxt.js divides the page rendering process into two stages: server-side rendering (SSR) and client-side rendering (CSR).Nuxt.js supports dynamic routing, middleware for route handling, and asyncData for server-side data fetching.Nuxt.js also provides a way to generate pre-rendered static HTML files for better performance and SEO.You can use Vue ecosystem tools such as Vue Router, Vuex, ESLint, and TypeScript with Nuxt.js.To optimize performance, you can use techniques such as code splitting, lazy loading, asynchronous data prefetching, and HTTP caching.Nuxt.js also provides features for error handling, validation, and workflow using its CLI tools.Integrating Nuxt.js with additional plugins is also possible, such as the popular Vee-Validate library for form validation.Overall, Nuxt.js provides an efficient and scalable way of building server-side rendered Vue.js applications.