Javascript: Introduction

So before we start learning Javascript, we should probably figure out what the hell it is (if you don’t already know, which some of you will since you came to this section). Javascript (or JS for short) is a popular programming language built into most (so many, that it’s probably fair to even claim "all") web browsers which runs on the visitor’s computer and is used to make webpages more interactive.
Javascript is used all over the web today, including in things like:

• Clocks
• Mouse effects
• Drop-down menus
• Tooltips
• Pop-ups

Javascript also has a variety of good libraries such as jQuery which make it a lot easier to do more complex things such as animation and doing certain things with elements - however we won't be covering those in this set of tutorials.