This is the hostname or domain that visitors used to reach your site. Typically this is your site's domain. For example, if you host your blog on
mysite.example.com, then your hostname report will contain
mysite.example.com. In some cases, your website might be hosted on other domains, such as when you create a mirror (copy) of your site to host on a domain in another country (e.g.
mysite.example.uk). In addition, if someone copies a page from your website directly without modifying any of the source code (including the tracking code) and places that page on their own website, your reports will reflect traffic to that page from that hostname as well. You can use view filters to ensure that traffic only from allowed hosts reaches your reports.