apt-get
PackagesPackage: apt
The same as apt, with stable output and options meant for scripts: apt-get install -y in an installation script, apt in a terminal.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
apt-get -y- Answers yes to every prompt, for a non-interactive run.
Lessons that teach it
No lesson names it among its useful commands; it appears inside other lessons' command lines.