Piwik is stuffed full of so many features, that it would easily take a small book to explain. But it is so simple to use once it is setup.
From your drag-and-drop control panel you can see live data on your site as well as all the usual metrics such as visitors, keywords that they used, products they purchased, and the conversion rates.
In addition to this, you can keep all your own data. Piwik runs on your server, hence you know that certain big global dominant providers aren't using your own data for commercial gain or even against you.
If you are a web developer, your customers will love Piwik analytics. Offer it to them as a deal sweetener. It can even be easily re-branded from within the Piwik control panel. The following ...