You are standing at a hotel check-in counter, phone in hand, trying to log into your email to find the reservation. The app wants your password. You don't remember it — you never did, really, because ...

You get an email from your bank. The logo is crisp, the greeting uses your real name, and it references a payment you actually made last week. It asks you to confirm a "flagged" transaction by clickin...

You reach for your phone, glance at the screen, and you're in. No typing a 14-character string you half-remember, no "reset your password" email, no little padlock icon judging you for reusing the sam...
