When you go to your favourite website, say YouTube, what is the most prominent thing out there? Ads. Those annoying banners and popup, if you don’t know, contribute to the agencies who sell those ad slots, a whole lot of money. Online advertising is a $40 Billion industry now, and all that forty billion comes at the cost of annoying you to a huge extent. It is also the way the websites make money. It is not the only way they do so though.