When you analyze what users are doing on your site you are able to make better decision about the content and information you place on specific pages. Let's go through a quick example to help you better understand what happens.
You check out the activity on your site over the last two months. Looking at the charts you see that one page has a really high bounce-rate. (A bounce-rate means that someone landed on this page first then left right away because it had no relevance to them and they just didn't want to stick around.) So, what do you do now? Go look at the page! See why they might not be sticking around. Maybe the page was just a contact page with the very basic information. If that's the case, liven it up some. Add an interactive map that lets you get directions or maybe even a photo or two. Give people a reason to stay and visit more pages.
How do you get this information? Google Analytics. All new web sites we design have an account that you can login and view at any time. Within the training portion of your agreement we will teach you how to read and stay on top of your analysis.
While we're on that subject, everyone wants their web site to be completely autonomous but it just doesn't work that way. At least if you want your site to be successful. You simply cannot tailor your pages to your audience if you don't stay on top of it. Call it a necessary evil. The more time you invest in your own site, the better off you are.