Java script,ajax,jquery,html,css and iis

Javascript, for the purposes of this question, is a client-side (in the browser) scripting language.

jQuery is a library/framework built with Javascript. It is very popular because it (nearly universally) abstracts away cross-browser compatibility issues and it emphasises unobtrusive and callback-driven Javascript programming.

AJAX (Asynchronous Javascript XML) is a method to dynamically update parts of the UI without having to reload the page - to make the experience more similar to a desktop application.

HTML

HTML (Hyper Text Markup Language) is a widely accepted web-design language.

HTML is responsible for the construction, and the total output, of a page.

There are three "sections" of a decent HTML document source: Inline, Internal, and External.

CSS

CSS (Cascading Style Sheets) is another widely-accepted web-design language.

Unlike HTML, CSS does not "create" anything. Instead, it decorates, aligns, and positions (etc) elements in HTML. In a nutshell, CSS takes the normal HTML output and adds a few rules to how it's actually displayed.