For example, if you import scan data from multiple sources, such as Nexpose and Qualys, you may need a way to easily identify the hosts that are from Nexpose and the hosts that are from Qualys. As you import the Nexpose data, you can set the option to automatically apply a host tag, like
nexpose_host, to every host. The same goes for the Qualys hosts, except you would use a host tag like
qualys_host.
After you tag the hosts, you can search for a specific host tag, which will return a list of hosts that match the search criteria. In this example, if you search for
nexpose_host, you will see a list of the Nexpose hosts that you imported. This is useful if you know that you want to run an exploit against a certain type of host and do not want to spend the time sorting through hosts and manually selecting them from the Hosts page.