Forum Moderators: martinibuster
Custom channels allow you to track the performance of specific groups of ad units. You design your own custom channels and use them to view performance of ad units in ways that are meaningful to you. You can create up to 2000 custom channels for each of your AdSense products[support.google.com...]
Here are a few examples of ways you can group and track ad units with custom channels:
*Ad sizes and colors
*Location of ads on a page — left side vs. right side, embedded in content or above it
*Page topics — articles about sports vs. entertainment