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Ctrl + Z is useful when you want to temporarily stop what you are doing in the text editor (like Vim) to go check on a file somewhere in your hard drive on the same terminal.
Ctrl-Z sends SIGTSTP, a signal this causes the process to suspend execution. In this case, it is resumable - try executing a command that will take a while and press Ctrl-Z; you'll see something in the lines of
[1]+ Stopped [your command].
Type fg in your Terminal and you'll see the process resuming, if it didn't end before resuming it.
You can probe this by typing in the cmd:
#sleep 60
CTRL+Z
#echo $?
and you rest 128 to this number, and you obtain the number of the signal, and then
#kill -l
and you will see all signals
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