Piwik is a Php MySQL Software program that you download and install on your own webserver. At the end of the five minute installation process you will be given a Javascript tag. Simply copy and paste this tag on websites you wish to track (or use an existing plugin to do it automatically for you).
Piwik is a downloadable, Open Source (GPL licensed) Web Analytics software program. It provides you with detailed real time Reports on your Website visitors: the Search engines and keywords they used, the language they speak, your popular pages… and so much more.
