Bloggers and internet marketers who have been into online marketing for years are familiar with affiliate marketing, and also with the fact that it is the most lucrative way to earn money online.
To define, Affiliate marketing is one of the oldest forms of marketing wherein you refer someone to an online product (not necessarily yours) and when that person buys the product based on your recommendation, you receive a commission.
Many online companies who sell products such as shoes, web hosting spaces, or some other service, usually offer an affiliate program. You can simply sign up for the program and get your unique tracking link.
Now, whenever you are writing about their product or promoting it, you can simply use your special tracking affiliate link to recommend the product/company.