Thanks for that! So that post says, "You can buy/sell Steem Dollars for Steem on exchanges." So, if I go to an exchange, like Bittrex, I can trade my U.S. dollar for either Steem or Steem Dollars? The difference being that Steem, like the U.S. dollar, is tradable to another person in exchange for a good or service... Whereas Steem Dollars is like holding a bond... I'd exchange my SD (SBD, SMD?) for Steem (or USD?) before purchasing a good or service? So, I can buy a cup of coffee with my Steem, but I will earn interest with my Steem Dollar. Is my understanding correct?