A scripting language that is used to create a more interactive environment. For example, it may be used for special effects like changing the look of a graphic when the cursor passes over it, or building menus that drop down or show other special effects. Search engines will ignore javascript, so any links or menus created using this (or any other scripting language) will be ignored.

Javascript links:

Javascript can be used to create links in a way that makes them invisible to search engines.