move back vs move to the back?

[crazYgeeK]

I can understand 'move back' but still be confused with 'move to the back' (whether it is similar to 'move back'?), I have read a passage where that phrase appeared, could you please exlain it to me? Does it need to be in a specific context to understand? If possible, could you please give me some context in which that phrase can be used?Thank you very much!

[5jj]

If you are told to 'move back' you may need to move only one step back. If you are told to 'move to the back', you will need to go to the far end of the room/plane/queue/etc.

[emsr2d2]

Imagine you are in the audience at the theatre. There are 26 rows of seats from Row A to Row Z. You are sitting in Row A. Someone asks you to move back. You could move to Row B, or C or any row to Row Z.
If you're sitting in Row K and someone asks you to move back, you could move to Row L, or M etc all the way back to Row Z.
No matter where you are sitting, if someone asks you to move to the back, you must move to Row Z.