ELI5: Explain Like I'm 5

Neckline

The neckline is the opening at the top of a shirt or dress that goes around your neck. It's like a little hole that lets your head go through so you can wear the shirt or dress. There are different types of necklines, like "round" which is a circle shape or "V-neck" which is shaped like a letter "V". Some people might like certain necklines because they feel more comfortable or they think it looks nice on them.