Touch ID isn't unique to the iPhone 6 but there is one Apple Pay-powered feature that is.
The iPhone 6 comes with NFC, also known as Near-Field Communication, and it's this feature that helps power Apple's mobile payment platform. That platform is also known as Apple Pay, you've probably heard it mentioned a few times.
Apple Pay is quick, easy and secure. We know that that sounds like an Apple commercial but it's the honest truth. We've been using Apple Pay and Touch ID to pay for various goods and services for close to a year now and we've never encountered a series problem.
And guess what? Apple Pay will only get better as time goes on and as more countries and retailers adopt the technology. We absolutely love it, Steve Jobs apparently would've loved it, and we think you'll love it too.
(Quick Note: You can use Apple Pay if you own an iPhone 5s/iPhone 5 but you need an Apple Watch for it to work.)