UTM Builder appends UTM parameters to a URL, letting you track traffic sources in analytics. By specifying campaign medium, source, and name, you create a link that logs exactly where clicks originate. This data populates in platforms like Google Analytics, revealing which campaigns or social posts are performing best. You can also add terms like utm_term for keywords or utm_content for split-testing different link versions. The UTM builder ensures consistent naming conventions and no mistakes in parameter formatting. It’s a vital tool for measuring ROI on promotional efforts, from email newsletters to paid ads.