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    Screen lock is a security feature for computers and mobile devices that helps prevent unauthorized access to the device. Also known as a screenlock or lock screen, a screen lock requires a specific action or sequence of actions to be correctly performed by anyone attempting to use a lockscreen-protected device.

    Screen locks or lock screens can require the user to enter a password or passphrase, perform a specific gesture or motion on the touchscreen, or access a biometric reader that analyzes the user s fingerprint, scans their eye or conducts a similar analysis for recognition of the user.