Campaign tags allows Google Analytics to identify where a user came from. It gives businesses more information on how effective their marketing methods are.
There are five campaign tags overall, and at least three are normally used. By using source and medium tags, it overwrites the default data that Google Analytics would normally use to track where traffic is coming from.
Let's say that there are two businesses advertising on the same website:
Keep in mind that if you fail to use campaign tags properly, it can lead to incorrect data in your campaign data in your reports.