Can anyone elaborate more on the - 군 salutation?

  •  
  • 113
  • 3
  • 0
  • Korean 
May 18th 2012 22:05 Korean salutation
I heard this -군 salutation before but I don't really understand exactly what is it used for.

From my understanding, it's a salutation used when addressing someone politely.

Is it only used among males?

I can't really find a clear elaboration on-line.

Thank you for your time.