Step 1: English Answer

Touch ID is a biometric authentication system developed by Apple Inc. that allows users to unlock their iPhone or iPad and make purchases from the iTunes Store and App Store by scanning their fingerprint. It was first introduced in 2013 with the iPhone 5s and has since become a standard feature on all new iPhones and iPads.

Touch ID uses a capacitive touch sensor to create a high-resolution image of the user's fingerprint. The image is then converted into a mathematical representation that is stored securely on the device. When the user attempts to unlock their device or make a purchase, their fingerprint is scanned and compared to the stored representation. If the fingerprints match, the device is unlocked or the purchase is authorized.

Touch ID is a very secure authentication system. It is difficult to spoof or hack, and it can be used to protect sensitive data such as financial information and personal messages. Touch ID is also very convenient, as it is much faster and easier to use than a traditional password.

Here is a more detailed look at how Touch ID works:

1. **The user places their finger on the Touch ID sensor.**
2. **The sensor creates a high-resolution image of the user's fingerprint.**
3. **The image is converted into a mathematical representation.**
4. **The mathematical representation is stored securely on the device.**
5. **When the user attempts to unlock their device or make a purchase, their fingerprint is scanned and compared to the stored representation.**
6. **If the fingerprints match, the device is unlocked or the purchase is authorized.**

Touch ID is a very reliable authentication system. It is accurate and fast, and it can be used to protect sensitive data and devices.

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Touch ID is Apple's name for their new biometric fingerprint authentication technology. With it, the Home button can now unlock your iPhone 5s and authorize your purchases on the iTunes Store. ... Put your finger on the Home button, and just like that your iPhone unlocks.read more >>