I use it to understand which site or link the user used to find an outdated link on our site. It's very helpful to know how he got there because often the refer

I use it to understand which site or link the user used to find an outdated link on our site. It's very helpful to know how he got there because often the references to that obsolete link are all purged in the code but somewhere deep inside the database or CMS somebody still put a link to the obsolete page.