jQuery is a framework, but isn't the only one. Another JS frameworks are AngularJS, Mootools, NodeJS, BackboneJS, etcetera. With anyone of this frameworks you will do any action that pure JS can't do, or any "complex" (I don't find the correct word) action. As Void said, adapting his answer to my answer about frameworks: "makes life easier for people who want to program for the browser."
