VBScript is a derivative of Microsoft's Visual Basic designed to be used for web server scripting and adding intelligence to web pages in Internet Explorer. Because it is lightweight and very easy to use it makes an ideal language for application Macros.
Please note that this guide is designed as a very brief introduction to the language. If you want a more detailed introduction, there are plenty of third party books - just go to http://www.amazon.com/ and search for "VBScript". There is also lots of material at the Microsoft web site.
See:
Creating and assigning variables
Simple interaction with the user