When registering I am asked to enter a BitCoin address. What is that?
Bitcoin address is your ID (account, wallet number), starting with 1 or 3 and containing 27-34 alphanumeric Latin characters (other than 0, O, I). The address can also be represented as a QR-code, it is anonymous and does not contain information about the owner. For example, 1HMWcQxn3M8mGF1kKupqZdQ54Cc4HvcN1d.