When a publisher is running CPC ads on his website, be it a blog, forum, or any kind of site, he will be earning from clicks on the ads. As long as these clicks are being generated genuinely, the publisher of the website, or the owner of the website, will earn. As opposed to CPM ads where there is no needs for clicks and only page views will counted, CPC ads will need clicks for the publishers to earn. Getting clicks on ads is very difficult and you need a lot of traffic. But for those who have traffic, this is one of the best ways to make money.