When you transfer any cryptocurrency to an exchange they will store it in their own wallet and you get a claim on that currency. So actually you are trading claims on the trade platform (and the trade platfrom keeps track of these claims).
Also most exchanges store a lot of their coins in cold storage for safe keeping (a wallet not accessible through the internet).
When you transfer any cryptocurrency to an exchange they will store it in their own wallet and you get a claim on that currency. So actually you are trading claims on the trade platform (and the trade platfrom keeps track of these claims).
Also most exchanges store a lot of their coins in cold storage for safe keeping (a wallet not accessible through the internet).