A configurator is a tool used to create new listings in bulk. It is used to collate listing details that a collection of listings will share, so that you don't have to specify the same listing information multiple times for multiple listings.
If you are listing similar products, it may be that these listings share common attributes. So that you don't have to specify the same information multiple times, a configurator is used to set base information once, and allow new listing to inherit that information when listing.
And example of shared inherited information may include product categories, shipping prices and payment methods.
To learn how to create a new configurator, follow one of the guides below