FRP lock stands for **Factory Reset Protection lock**. It is a security feature on Android devices designed to protect user data in case the device is lost or stolen. This feature prevents someone from performing a factory reset and accessing the phone without proper authentication, usually the Google account credentials previously associated with the device.

Here's how FRP lock works:

1. **Enabled on Reset**: When FRP is enabled (which it usually is by default on modern Android devices), it triggers a security check if a factory reset is attempted.

2. **Authentication Required**: After a factory reset, the device requires the original Google account credentials (username and password) used on the device prior to the reset. If the correct credentials are not provided, the device remains locked and cannot be accessed.

3. **Preventing Unauthorized Access**: This feature is intended to protect against unauthorized access and data theft if a device is stolen or lost and someone tries to wipe the data to resell or reuse the phone.

While FRP lock is a valuable security measure, it can also pose challenges for users who forget their Google account credentials or buy a second-hand device without proper documentation. Unlocking an FRP-locked device without proper authorization can be complex and often requires contacting the device's manufacturer or carrier, or other legitimate means of proving ownership.
Source: https://frpbypassapp.com