A practice that underhandedly deposits cookies from merchants onto users computers when the user has never visited the merchant through the affiliate's link and potentially may not have even the affiliate's website. Cookie stuffing is done with the intent of stuffing as many cookies as possible onto as many user computers as possible in the hopes that they eventually come accross the merchant website and make a purchase. The larger and broader the merchant, the more likely that is to occur (think Amazon). Cookie stuffing is heavily looked down upon by legitimate affiliates and most merchants ban affiliates using cookie stuffing in their affiliate agreements.
Affiliate marketing can be a big source of revenue. The key to maximizing your affiliate earnings is to provide additional value and to engage your readers. Unlike traditional ads where you are paid for impressions or clicks, affiliates are only paid if or when a specific action is performed. The action might be something as simple as signing up for a newsletter to submitting their zip code information up to having a sale completed. Regardless, you are not paid until you've compelled your readers to take some type of action.
There are two ways to approach affiliate marketing: You can offer an affiliate program to others or you can sign up to be another business's affiliate. As the business driving an affiliate program, you'll pay your affiliates a commission fee for every lead or sale they drive to your website. Your main goal should be to find affiliates who'll reach untapped markets. For example, a company with an e-zine may make a good affiliate because its subscribers are hungry for resources. So introducing your offer through a "trusted" company can grab the attention of prospects you might not have otherwise reached.