When i set command in variable, is it executed too?

Hi, i want to ask about back script syntax.

As you can see below, i set variable vmrestartt which runs complex script command vzctl ***

I want to ask if it mean that when i define this variable, the command/script (vzctl ***) in this variable is executed in full? so i dont need to call it on new line like:
$vmrestartt
?

Code:

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vmrestartt=$(vzctl restart $ctid)
if [[ "$vmrestartt" == *"exited with status 7"* ]];then
vzctl chkpnt $ctid --kill
sleep 10
vzctl --verbose restart $ctid
fi

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this command should 1) kill virtual machine checkpoint and 2) restart virtual machine if during classic virtual machine restart an error message (exitted with status...) appear... Thank you

thank you