I'm brand new to Bitcoin transactions and for my first sending transaction only a small amount was received on the other end.  When I click on "view transaction" I see that the missing amount was sent to some other address and it is highlighted blue.  This blue highlighted amount is different from what the fee of the transaction was.  So I have 1. un-highlighted amount that was received 2. green highlighted amount which appears to be my balance in the wallet and 3. a blue highlighted address that has the missing amount (when i view the transaction after right clicking).  What is that address and how did it get the "missing" amount?