Summary
You can use Touch ID to unlock your iPhone by pressing the Touch ID sensor with the finger that you registered with Touch ID.
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Additionally, you can use Touch ID instead of your Apple ID password to make purchases in the iTunes Store, App Store, and Apple Books.
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Touch ID is an electronic fingerprint recognition feature designed and released by Apple Inc. that allows users to unlock devices, make purchases in the various Apple digital media stores (iTunes Store, App Store, and Apple Books Store), and authenticate Apple Pay online or in apps. It can also be used to lock and unlock password-protected notes on iPhone and iPad. Touch ID was first introduced in iPhones with 2013's iPhone 5S,[1] In 2015, Apple introduced a faster second-generation Touch ID in the iPhone 6S; a year later in 2016, it made its laptop debut in the MacBook Pro integrated on the right side of the Touch Bar. Touch ID has been used on all iPads since the iPad Air 2 was introduced in 2014. In MacBooks, each user account can have up to three fingerprints, and a total of five fingerprints across the system.[2] Fingerprint information is stored locally in a secure enclave on the Apple A7 and later chips, not in the cloud, a design choice intended to secure fingerprint information from users or malicious attackers.
Touch ID - Wikipedia
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