This is a very simple option to use and at the same time can be very useful for those advertisers that want to organise their content.
The tag option will allow you to sort your campaigns according to your own criteria. It is very useful when you need to manage a large number of campaigns and / or different types of campaign. Instead of having a large list with all your campaigns mixed together with no order or criteria, you can sort them by country, product, payment formula, etc.
In other words, this is an easy way to organize all your information related to your reports and statistics in order to keep it clear.