jQuery CDN is a way to include jQuery in your website without actually downloading and keeping it your website's folder.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Salesforce Interaction Studio (formerly Evergage) is a cloud-based software that allows users to collect, analyze, and respond to user behavior on their websites and web applications in real-time.