Statistics cookies are normally used when the site or service provider wants to find out how the site is used by their users. For example they allow the owner the monitoring and analyzing of the behavior of users of the website to which they are linked.

The information gathered through such cookies is used for measuring the activity of the website, platform or application and for profiling navigation of users of the website, platform or application, in order to improve the website.

Normally third party services such as Google Analytics are used for this purpose and you may see cookies from them rather then the site owner.

Generally, a site should be able to provide services to you without the use of statistics cookies.