Ad ID is a term that generally has two references: 1) a unique identifer for an advertising asset, commonly associated with a registry such as Ad-ID.org or an internal identifer such as ISCI, and 2) a short cut for “advertising identifier”, a unique identifier associated with a device on which advertising will be shown that is used for greater control in the targeting of ads to the device. Popuar advertising identifiers include Apple's identifier for advertisers (IDFA) and Google device identifier for Android known as Android Advertising ID (AAID) or Google Advertising ID (GAID).