ATS is currently an opt-in option, albeit essentially important in banking and eCommerce apps, but will become mandatory across all apps sold in the App Store in 2017.
The feature allows apps to send data over the internet more securely, while in HTTPS connections, meaning data cannot be read when access is not authorized.
While, the all HTTPS connections move is inline with Apple's stance on privacy, as exemplified in the saga with FBI to crack into an iPhone belonging to Syed Farook, one of the attackers in the shooting at San Bernardino, California.
And the more secure the connection type, better authentication and encrypted data transmissions is possible.
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