An affiliate is like an independent salesperson that gets a commission on each completed sale. You can be an affiliate of many affiliate programs or just one. It’s your choice. And you can sell anything online from physical products like DVDs, vitamin supplements to digital products like ebooks and music MP3 files. Becoming an affiliate is not a difficult task on the internet. There are dozens of affiliate programs online that accepts almost everyone into their program. And registration is in most cases, free.