All web servers track basic information about their visitors. This information includes, but is not limited to, IP addresses, browser details, timestamps and referring pages. None of this information can personally identify specific visitors to this site. The information is tracked for routine administration and maintenance purposes, and lets me know what pages and information are useful and helpful to visitors.
Note that you can change your browser settings to disable cookies if you have privacy concerns. Disabling cookies for all sites is not recommended as it may interfere with your use of some sites. The best option is to disable or enable cookies on a per-site basis. Consult your browser documentation for instructions on how to block cookies and other tracking mechanisms.