One can make money online using various techniques, but possibly the most common way to do this is via internet marketing. This when you sell a product on behalf of a merchant and earn commission on each sale. Thousands of people are participating in internet marketing, some making more then others and some making huge amounts.
To help one do this there are affiliate companies who run affiliate programs.You can partner with a company running an affiliate program (there are 1000's out there) then you sell their products online via links. The preferred method is to have your own site to put vendor links on. These links go back to the vendors site and when someone purchases using your link you get paid.