For millions of internet users, this moment is a routine annoyance. It is the digital equivalent of being stopped by a bouncer before entering a club. You know you aren't a troublemaker, but the bouncer doesn't know that yet.
This is a "Reverse Turing Test." In standard computer science, a machine tries to convince a human it is intelligent. In a CAPTCHA, a human must prove they are not a machine.
You click a link, expecting to read a news article, buy a ticket, or check a forum. Instead, the screen goes white, a spinning icon appears, and you are met with a stark, grey prompt:
The infamous Cloudflare challenge!