What does eBay do?

Ebay is an online auction website where people pay a fee to sell their things on it, and if you make an account you can bid for the things on sale:)

Another answer

eBay doesn't "do" per say, anything for us, it provides a service for anyone and everyone to sell or buy items of their choice. Us users do most of the work, well, of course they do a lot of work too, I didn't mean they don't. But, it's most a service the provide and a gateway to do business online.