A visitor group is a set of classifications used to identify users visiting your application. Available visitor classifications include IP address/range, organization, tag, location, and user ID. For more information, see the visitor types documentation.
A visitor is a valid member of its visitor type. For example, "1.2.3.4" is a valid IP visitor, but not a valid organization visitor.
Visitor groups are used by policies to determine if a visit triggers that policy. One visitor group can be used by multiple policies.