What is a referrer?

HTTP referrer allows you to obtain information about the source (URL) of your survey. This information is saved and stored in individual reports. It allows to match individual report with survey source (eg. website on which survey link has been placed).

Referrer allows you to :

• Localize source page of a survey (this is especially helpful with website surveys).
• Integrate survey with a discussion board, portal, social network or help desk service so you will be able to identify responses given by each respondent.
   

You can read more about referrer on Wikipedia.