By using channels you can track the impressions generated from your different websites or forums where you post.
for example, you belong 3 websites where you implement google adsense (by adding code to the script).
and there are 2 forum where you can earn revenue by posting message.
so, you have total 5 sources (3 webs + 2 forums) from where adsense revenue will generate.
now, if your adsense report shows a total of 500 impressions and 50 clicks.....you will be able to know the number of impressions and clicks generated in each source.
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