You'll want to know how many visitors your site is getting, where they are coming from, where they are going, etc. There are several ways of doing this. But first, a few definitions are in order. Website analyzers refer to traffic in several different ways.

The most common are hits and uniques. Hits are the number of elements downloaded, such as a page, image, etc. Uniques are uniques visitors, no matter how many pages they visit on your site.

So how to gather and analyze this information?

Google Analytics. A wonderful and free tool, Google Analytics allows you to track visitors, how long they stayed on your site, where they went, etc. You will need to copy and paste some code into every page on your site for this to work. This can be a pain, but works well with Content Management Systems, which use a single PHP page to "build" the other pages of the site.

AWstats. This is usually provided in CPanel, so if your hosting company provides that then you already have it, it's already installed, and you can just click it to get visitor information.

Webalizer. This is also provided along with CPanel, and is similar to AWstats.