This tool helps you to trace number of people who visit your websites or webpages everyday and calculating the differences between the targeted visits and the
actual ones.
Google Analytics is produced to make life easier for Marketing people .. like me =D .. where it assists them to target ads. in a better way and strengten their marketing plans ..
There are much more significant and useful features of google analytics you can read about by clicking on this link: Google Analytics Features
Oh yeah .. I forgot to tell you guys the most awsome feature is that the tool is for FREE !!
and here's a link of Google Analytics Tutorial
Best regards,
Meshael .. =)