Referring Major Domains

This display lists the major root domains (".com", ".net", ".gov", ".edu", etc.) that your referrering sites are registered with when they direct a visitor to your site.

Terms Used on Report:

Visitors

Also referred to as a 'Unique Visitor'.  By default, this value represents a visitor that comes to your site for the first time in a day.  All subsequest visits during the day by the visitor are not considered unique.

The definition of a visitor can be customized.  You can set a custom period of inactivity that will cause the next access of the visitor to be considered a new visit.  The visit definition screen can be found on the 'Setup' menu.

This differs from a page view or hit in that a single visitor can have one visit per day but many page views during a visit.