what is vue.js used for code example

Example 1: vue js tutorial

//Best project Tutorial i have seen
https://www.youtube.com/playlist?list=PL55RiY5tL51qxUbODJG9cgrsVd7ZHbPrt

Example 2: what is vue.js

Q: What is Vue.js?

A: Vue.js is an open-source model–view–viewmodel front end JavaScript
framework for building user interfaces and single-page applications. It was
created by Evan You, and is maintained by him and the rest of the active core
team members.