Single-Touch Attribution tools credit a conversion or sale to the campaign judged to have made the greatest impact on a customer during the conversion process. These tools include Last-Touch Attribution, or the tool that last that interacted with a customer, or lead prior to conversion. These tools also include First-Touch Attribution, or the campaign that first brought the lead into the sales process prior to conversion. These tools are often used by marketers with just one or two campaigns running concurrently, due to their simplicity and the out-of-the box nature of the tool.