Used to check security by seeing who's outside without opening the door. Before letting the stranger in, she peeked through the peephole.
Pro Tip 2/3
Privacy Preserver
Provides privacy as the person outside cannot see through it. She felt safe knowing outsiders couldn't peep through the peephole.
Pro Tip 3/3
Commonly Misunderstood
Not to be confused with a small window as it's specifically for looking through doors. The peephole isn't for letting light in; it's for you to identify visitors.