What is an IDFA or Apple Identifier for Advertisers?

First, developers checked if marketing tools besides IDFA fall under Apple's definition of not-so-private For instance, initially many

IDFA is the abbreviation for IDentifier For Advertisers It's an Apple-created random identifier assigned to a user's device Advertisers use it much like a

idfa meaning The IDFA is what tells an advertiser if an ad is working, where conversions come from, who is converting and which part of the budget is

6162 meaning IDFA number – but what does this really mean for in-app advertising? what is a user's IDFA? An IDFA is a