It's said that "The advertising ID is a unique, user-resettable ID for advertising, provided by Google Play services. It gives users better controls and provides developers with a simple, standard system to continue to monetize their apps." in https://support.google.com/googleplay/android-developer/answer/6048248?hl=en
But i need more information about google advertisement ID. How can this advertisement ID specifically help developer in advertising/monetizing their apps? Do developers able to get some information about the user from google by using user's google advertisement ID? or does this ID only helps developer to identify the user's advertisement so that developer can build their own tracking database about the user?