Referrer

Referrer

Hello

While I am looking at the entries of a form I see an additional field: Referrer Name
What is it exactly? Why does it appear there though it is not designed there on the form?

This is the form that I am talking about where I see it
https://forms.zoho.com/sridhar/report/WeeklyInspectionofProcessingFacilities_Report/records/web

I have attached the screenshot of this entry 

Thanks & Regards
Sridhar