Google adsense is the best way to monetize our blog content and earn money from it.Google is best CPC(Click per Cost) advertising network that pays money to publishers and so tracking adsense earning more important incase of we are contributing on lots of revenue sharing websites and blog.
Custom channels lets you to track the performance of specific groups of ad units. You can design your own custom channels and use them to view performance of ad units in ways that are meaningful to you.
To create new URL channels,you need to login to your Google adsense account > My ads tab > Content > URL channels & from there you have to choose New URL Channel.After choosing that option, a separate box will appear there you will have to add URL of website.
You can add upto 500 URL channels from there.After clicking on Add URL channel button,URL channels will be in your adsense account.The URL channels will be useful when you are creating new adsense for content unit.That time you will have to add URL channels to the ads unit.An Adsense URL channel will track page views, clicks, click through rate (CTR), page eCPM, and estimated earnings for a single article or an entire site & display that information on your adsense account.
You can remove or deactivate any URL channels that are not in use.You can later track all performance of URL channels from your adsense account by going to Performance reports tab > URL channels.
Related : Earn money from Adsense for Search