As technical geeks we have long since forgotten how to talk to regular people. So please look up terms that are not clear.  

Here are a few understandable reference links to click:

Basic Internet Terms

The Free On-Line Dictionary of Computing

The Marketing Manager's Plain English Internet Glossary

Here is a more comprehensive and in-depth reference:

PCWebopaedia

The Computer Desktop Encyclopedia, by Alan Freedman is an excellent, clear reference. It isn't as difficult as one might expect.  If you really need to start simple, then get one of the dictionary picture books by IDG-Maran Graphics.  You need to pay for these references. They aren't free like the ones above.  Try  the online bookstores ( http://www.amazon.com    or http://www.barnesandnoble.com ).