User Agent Exclusion
FREE plans and above
The 'Exclude User Agent' box allows you to exclude from the stats all visits coming from visitors with a given user agent.
The user agent of a visitor is the software he is using to navigate your site. Typically an operating system and a browser with their version numbers. You can get the full user agent of any visitor by hovering your mouse over the browser or OS column of the visitor details report.
For instance, your user agent right now is CCBot/2.0 (https://commoncrawl.org/faq/)
Typically this is used to exclude unwanted visits. Web-Stat automatically excludes all robots and spiders, but some might make it through the cracks and need to be excluded manually.
Other popular exclusions are the Google Preview (google web preview) or MSN preview robots.