Emails

Beware of --> Phishing & Other Suspicious Emails 

Know how to --> Identify legitimate emails from the App Store or iTunes Store 

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams —> Use these tips to avoid scams and learn what to do if you think your Apple ID has been compromised.

Because there is always somebody who is trying to get you to reveal your Apple ID credentials for their benefit. Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support