I don't know what "silent install" is. In my Updates options, "Use a background service to install

I don't know what "silent install" is. In my Updates options, "Use a background service to install updates" is checked. I was told, when it was too late to change it, that this might be the problem. But with "Check for updates but let me choose whether to install them" checked, it should not install without my permission no matter what else is checked.