What is "ember.js"

Ember.js is an open-source JavaScript web framework, based on the Model–view–viewmodel (MVVM) pattern. It allows developers to create scalable single-page web applications by incorporating common idioms and best practices into the framework.

Ember is used on many popular websites, including Discourse, Groupon, Vine, Live Nation, Nordstrom, Twitch.tv and Chipotle. Although primarily considered a framework for the web, it is also possible to build desktop and mobile applications in Ember. The most notable example of an Ember desktop application is Apple Music, a feature of the iTunes desktop application.

In November 2015 ember-cli was downloaded over 200,000 times from its npm repository.