If you have a website for your business, then it is important for you to be able to easily track the performance of it. This data can be invaluable when it comes to marketing and knowing how and where to spend your budget.
There are many programs that offer statistic tracking the most used on being Google Analytics. Although Google Analytics is very user friendly and free, it is not always the most accurate in terms of real visitors.
Web server stats are usually bolted on to every hosting package, but these are often quite limited in terms of data and sometimes record visits from spiders that crawl your site. They are also often not very user friendly and only give you very limited information. Ideally you should use several stats packages to try and get a true picture of how your website is performing.
Once you have this data, put aside some time each month to analyse it in detail and find out what marketing avenue is giving you the best return on your investment. If you find for example, that you are investing a lot of money in Google Adwords but hardly getting any qualified traffic then you may want to think about stopping your adverts and investing the money elsewhere.