In computer science, a software framework is an abstraction in which software providing generic functionality can be selectively changed by additional user-written code, thus providing application-specific software. A software framework provides a standard way to build and deploy applications.
"Walking on water and developing software from a specification are easy if both are frozen." - Edward V Berard -
A software framework is a universal, reusable software environment that provides particular functionality as part of a larger software platform to facilitate development of software applications, products and solutions. Software frameworks may include support programs, compilers, code libraries, tool sets, and application programming interfaces (APIs) that bring together all the different components to enable development of a project or system. (Source)
It is maintained by Facebook, Instagram and a community of individual developers and corporations.
Ember is used on many popular websites, including Discourse, Groupon, LinkedIn, 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.
AngularJS is the frontend part of the MEAN stack, consisting of MongoDB database, Express.js web application server framework, Angular.js itself, and Node.js server runtime environment.