What does Touch ID enable users to do?

Touch ID is a biometric authentication feature that allows users to securely unlock their devices and authorize purchases through their fingerprint. This functionality significantly enhances security and convenience, enabling seamless access to the device's home screen and various services without the need for entering passwords or passcodes. By simply placing a registered finger on the Touch ID sensor, a user can quickly unlock their iPhone or iPad, as well as approve transactions on the App Store or within supported applications that require payment authorization.

While other options may sound relevant, they don't accurately reflect the core function of Touch ID. It does not directly impact the device’s performance in terms of running applications faster or changing settings, nor does it specifically activate voice commands.