A shopwindow is a big window at the front of a store where the store shows things it wants to sell.
Shopwindows are important for stores to show what they have and make people want to come in.
Examples:
The shopwindow has pretty dresses in it.
I like to look at the shopwindow when I walk by.
The shopwindow is very big and clean.
The shopwindow is so full, it looks like the store is inside out!
The shopwindow is so big, it's as tall as a house!
I saw a big dog in the shopwindow today.