Amazon is the biggest e-commerce company in world and its happening due to its service and support. This company was founded by Jeff Bezos which was selling only books in its starting years. But gradually Amazon made it to one of the most eminent brand in E-commerce industry.
The fact is that paperback books are still the most purchased product online among all items. Amazons service is really customer centric, and thats what makes it most popular online shopping company.