To verify that the user interacting with the system is indeed human, many websites and applications use a simple yet effective method. This process typically involves pressing and holding a specific key or button on their keyboard for a few seconds.
Once the user confirms they are human by completing this task, they receive access to the desired content or functionality. The purpose of this verification step is to prevent automated bots from accessing sensitive information or resources that should only be available to genuine users.
Source: https://www.sfgate.com/local/article/northern-lights-bay-area-20355906.php