What does the Amazon Buy Box actually do, and why do Amazon sellers fight for it? Simply defined, the Buy Box is used by Amazon's algorithm to reward sellers by generating the maximum sales if they meet the requirements. As a result, Amazon sellers make all efforts to perform well on the platform and remain ahead of the competition in order to win it. If you want to compete for the Buy Box, make sure you have the best products, the best pricing, and a low number of complaints.