No, not a way to look for apples. It is a way Apple is tracking your iPhone. The new operating system that came out a few weeks ago has a feature that is turned on by default. IFA or IDFA stands for "identifier for advertisers." It is a random, anonymous number that is assigned to you and your iPhone.
The good news is that you can turn it off so advertisers cannot
track your every move.
First, what it does. When you look at an app, or browse the web,
your presence generates a call for an ad. The site you are looking
at passes the IFA to the ad server so an advertiser knows a specific
iPhone user is looking at a specific publication and can direct a
specific ad to you.
To disable this, go to "Settings," "General," then "About," and then
"Advertising." The tracking control is titled "Limit Ad Tracking,"
and must be turned to On. On means 'limit tracking' so tracking is
not working. Interesting, you have to turn it on to turn