Ends one app that has stopped responding. Anything unsaved inside it is lost, but the rest of the machine is untouched — always try this before restarting everything.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
lifting the needle off a stuck record.
For example
One program freezes and will not close. You end that one program. Everything else stays exactly where it was.
This is one card out of 275.
The hundred words you meet most are free — the whole set, animated, in one file that works with no internet.
Volume 1 has all 275 in fifteen chapters, with Staying Safe the largest chapter on purpose.