Basically they have a smart contract that controls a reserve token that acts like a market maker. When you buy a token from it the price goes up. When you sell to it and take from the reserve the price goes down.
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I didn't understand this also, why we have to use ethereum to buy there ?
So they don't have to create their own blockchain. Basically it's a market like an exchange, but instead of people buying and selling setting the price, the price is set by an algorithm.
is there some good video about how to use bancor ? or some good website ?
You can try the bancor website.
That is why it is suggested to all investors for future ICOs, to dig all the information well to finally have a clearer vision of the purpose of that ICO, do not think only to make a personal profit, think of our future that we both want to get rid of capitalism . Generally the answer is in the "Source Code", so go straight there. I wrote a little about it in my blog, I hope it will be very helpful.
https://steemit.com/bancor/@robertovelasquez/bancor