You must know where your visitors come from and make sure you don't loose them to other sites.
New and returning visitors are the most important part of every site.
Traffic can come from three different sources:-
Direct Traffic
From people typing your site name into their browser. Perhaps after an advertising campaign or from reading company literature etc. Viral campaigns may also show up this way.
Referring Sites
Other websites that link to you. These links are vital as they are also important for search engines to find and rate your site.
Search Engines
People coming to you because of the text you put in your site.
Online Advertising
Adwords PPC (pay per click) is the most widely used but there is a wide range of paid online advertising options
Understand whether traffic and buyers are local and whether they return regularly or only visit once.
Good analytics packages can identify how the people that purchased came to your site. If you know where your buyers come from then you can concentrate on their source rather than ones that don't buy.
Use this form to analyse and help understand your website visitors