Discussion for: Hosted Libraries | Google for Developers

http://ajax.googleapis.com/

https://ajax.googleapis.com was a Google-hosted Content Delivery Network (CDN) that provided popular JavaScript libraries and hosted Google's own AJAX Search API. Developers would link to these scripts on ajax.googleapis.com in their web pages to load libraries like jQuery. While the AJAX Search API is now largely deprecated, the hosted JavaScript libraries and the domain itself are still active for various open-source libraries, although many versions are no longer updated.