The parameters in the tracking link allow you to accurately determine the source of the lead. The tracking link means that you do not have to generate dozens of different configurations, you only need one with the tracking parameter. Due to this, you can use only one configuration and promote it on several websites, knowing at the same time where the lead comes from.
Data from tracking links can be found in the "Leads" tab, in the "Statistics" section of your publisher's panel and through the postback API. You can go to the "Leads" tab by clicking HERE.