Selling your products alone in your website is the only way to make money in the internet. Although this may be your best source to make thousands of dollars, you can also make money through the products and services of others. Google Adsense allows you to do this, especially if you have a high traffic.
Google's Adsense allows for the advertising of other websites that has the same niche as your site. As more people click on the advertisements on your site and they go to the site of the advertiser, you earn some money. Advertisers will pay for traffic that came through your site.
Google is a name that many web users know by heart. Its years of service have built it a reputation that is one of the most reliable in the internet world. That is why you can be sure that having and using Google Adsense can make you earn extra money.
But it can also be the other way around. You can be the advertiser with the Google Adword. By enrolling with the Google Adword you can be sure that every time someone searches with google using keywords related to your niche, then you will be on the top page all the time.
This means that more people will be aware of the existence of your site. More traffic flow means more potential customers and clients. More clients mean more sales which in return mean more profits.
You may have to pay a commission for the traffic but that's okay. You at least get to increase your profits. The commission can just be chalked up as a marketing cost.