A doubt on Pooling layer

Dear Mentor,

There is a sentence quoted from assignment:
“The pooling (POOL) layer reduces the height and width of the input. It helps reduce computation, as well as helps make feature detectors more invariant to its position in the input”

Could you please guide me how to understand the"more invariant to its position in the input"?

Thank you.

@JJaassoonn ,
You can take a look at link to get more info about Pooling Layer.