What does 'downloading.. do not turn off target' mean?

[AC Question]

need help with my phone

what does downloading do not turn off target mean

 

[Rukbat]

Re: need help with my phone

You're in "Odin mode". If you're actually downloading something to the phone (like a new ROM), it means "do not turn off the phone or you'll be sorry".

If you got there by mistake, just press the power button until the phone restarts.