Add/? ref= What does "source URL link" do?

In a URL,"? ref= is a query string parameter that can be used to trace the origin of the link.

Usually, when someone clicks on a "? When ref= a link to a parameter, the clicked website will record the value of this parameter as reference information to help analyze the source of traffic.

This is important in areas such as advertising marketing and SEO optimization because it allows webmasters to understand which channels generate the most traffic and revenue.

Also,"? ref="can also be used as a simple tracking tool to record the effectiveness and performance of certain activities.