Amazon is the largest third-party logistics providers (3PL) company in the world. Basically, with FBA you ship your inventory to Amazon, advertise your products for sale on their platform, and the online powerhouse takes care of the rest: pick, pack, ship, and even customer service. Amazon FBA has become one of most popular ways to earn income online. In fact, are over 2 million people selling on Amazon worldwide. Amazon allows retailers to reach out to millions of customers that they may not have been able to reach alone.