Technically when you send coins to the exchange, the exchange will cold store your coins and in return gives you their token of a representation of that coin you sent. Likewise for fiat. So, when you buy and sell, you are technically trading the exchange fiat token instead of the real coins and fiat.
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yup, that make sense. I have once encounter trying to buy coin, yet got denied. Is frustrating. Likely was due to how popular the coin is and they run out of token, or reserving not to let us ride on the bull wave.