Getting Started with Angular JS

official site of angular Js provide us two options for the use of Angular JS library i.e. Github and a local file for download as seen in the page https://angularjs.org/

• This screen offers various options for selecting Angular JS as follows:
• Downloading and hosting files locally
  • There are two different options : Legacy and Latest. The names themselves are self-descriptive. The Legacy has version less than 1.2.x and the Latest come with version 1.3.x.
  • We can also go with the minimized, uncompressed, or zipped version.
• CDN access: You also have access to a CDN. The CDN gives you access to regional data centers. In this case, the Google host. The CDN transfers the responsibility of hosting files from your own servers to a series of external ones. It also offers an advantage that if the visitor of your web page has already downloaded a copy of AngularJS from the same CDN, there is no need to re-download it.

Source :: http://www.tutorialspoint.com/angularjs/angularjs_environment.htm