Vue.js (or Vue) is an open source JavaScript framework created by Evan You and released in 2014, used to build user interfaces and single-page web applications (SPAs). It is designed to be adopted progressively: you can add it to a single part of an existing page or build an entire application with it.
Like React, it works with components that react to data changes. It stands out with component files that bundle the HTML template, logic and styles, and with a learning curve known to be gentle. Its official ecosystem includes Vue Router (navigation), Pinia (state management) and Vite (a build tool created by the same author). Nuxt is the application framework built on Vue.
Vue has a strong community in Europe and Asia, and is widely used by agencies, SaaS vendors and projects modernizing an existing application.
Why it matters when hiring
The Vue talent pool is smaller than React's. A good React developer picks up Vue quickly and vice versa: insisting on Vue at all costs often lengthens the search with no real gain. Check JavaScript and TypeScript mastery instead, and the version they used: the move from Vue 2 to Vue 3 changed a lot, and having led that migration is a good signal.