Hello, Affiliate marketing is when you sell a product and or service for another company and make a commission from that company. Usually you will recieve an affiliate link (a unique URL link) that will be tracked to you. Whenever somebody clicks on that link and buys from that link it gets tracked back to you and you make a commission. Does this help alittle? Take Care
And Google Affiliate Network is pretty much what the guy above described, check it out on their site to find a little more information
Commission based online marketing for any product or service through website adds that is called affiliate marketing