Software and Updates Restart notification Stretch

[Anil Duggirala]

hello,
I am getting a notification in Gnome saying there are packages to be
updated and I get the option to click on a button saying Update and
Restart. However, if I do a regular apt upgrade, I dont need to restart
my system. Why am I getting this notification? since when do I need to
restart my system to upgrade any package in Debian?
thanks,