New calorie-tracking apps with A.I. promise better accuracy. But researchers who study calories say that there’s a better, ...

Step-by-step guide to setting up two-factor authentication on Google, Apple, Microsoft, and social platforms for stronger account security.

A little known security feature on iPhones is in the spotlight after it stymied efforts by U.S. federal authorities to search devices seized from a reporter.

Learn how to activate your Venmo debit card quickly in the app or by phone, plus what to do if activation isn’t working. Here ...