How do I create a website that will allow a user to easily edit.

This is totally a question I should know the answer to, but, I don’t. I have worked for a company for the past year maintaining only their sites and then was let go when I needed to take maternity leave. So, here I am 7 months later designing sites on the side.

Enough background. :) Here is my question.

I use Dreamweaver CS4 to create sites for my clients. But I would like to know where/what I could use so that my clients could easily make changes to certain areas of their site. i.e. I design the site in Dreamweaver… upload it somewhere… make a certain area editable with an easy user interface. So that they will not need to contact me for daily inventory changes.

Does any of that make sense? I know it is a basic question, but I don’t even know what to search for.