Types of Advertisements
Advertising on the internet is a very diverse industry. Light-profit ads such as Adsense operate on a pay-per-click basis, or PPC. A PPC advertiser, who chooses to post Adsense ads on their site, will earn a certain amount each time a visitor clicks an ad. Some ads are worth more than others.
An example of how all of this works: A website uses Google Adsense as a way to earn money through advertising. The webmaster posts an Adsense ad within an article with the title "New Rap Music Songs". The Adsense ad will then yield content relating to the article itself. So, it may display links to rap music sites, or it may display a large picture of Lil Wayne. Because the topic of rap music is already highly populated on the internet, this particular article will not have a very high paying PPC. The webmaster can expect to get as little as 5 cents each time the ad is clicked by a visitor.
However, if the websmaster were to write an article on a less populated topic, such as mesothelioma, the result would be quite different. Because the article's focus would be on mesothelioma, an ad placed on the same page as the article would generate an advertisement based on mesothelioma, or similar. This advertisement would pay up to $10 per click.
Private advertising is the best for of advertising. Once your website has gained enough popularity, you can bypass low paying services such as Adsense, and manage your own ads. For example, a website owner could charge up to $500 a week to display an ad for another website.