To confirm that you are a human and not a bot, many websites use a technique called “CAPTCHA” or “hCaptcha”. The process involves pressing and holding a specific key on your keyboard to display the reference ID. This ensures that only humans can view the code, preventing automated scripts from accessing it.
The system generates a unique reference ID for each user, which is then displayed on the screen along with an instruction to press and hold a specific key. The user’s browser captures this action, and the system verifies the response before allowing access to the website or service.
This additional layer of security helps protect against automated attacks, such as those from spammers, hackers, or other malicious actors. By requiring humans to interact with the CAPTCHA system, websites can minimize the risk of unauthorized access and ensure a more secure online experience for their users.
Source: https://www.sfchronicle.com/health/aging-longevity/article/memory-loss-symptom-treatment-20394237.php