In a URL, "? Ref=is a query string parameter that can be used to track the source of the link.
Usually, when someone clicks a link containing a "? Ref=parameter, the clicked website will record the value of this parameter as reference information to help analyze the source of traffic.
This is very important for advertising marketing, SEO optimization and other fields, because it can let website administrators know which channels bring the most traffic and revenue.
In addition, "? Ref=" can also be used as a simple tracking tool to record the effect and performance of certain activities.
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