To verify that the user is indeed human and not a machine, a common method used is to require them to press and hold a specific button or key on their keyboard for a short period. This task forces users to physically interact with the device rather than simply clicking a mouse or pressing keys quickly.
The purpose of this step is two-fold: it prevents bots from using automated software to complete tasks, and it also helps to protect user accounts from malicious activity. By adding an additional layer of human interaction, website owners can increase security measures without compromising user experience.
This type of verification process has become a standard practice in many online applications, including login systems, contact forms, and other interactive elements.
Source: https://www.sfgate.com/food/article/in-n-out-owner-responds-backlash-california-20780518.php