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CAPTCHA
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== Purpose == The purpose of CAPTCHAs is to prevent spam on websites, such as promotion spam, registration spam, and data scraping. Many websites use CAPTCHA effectively to prevent bot raiding. CAPTCHAs are designed so that humans can complete them, while most robots cannot.<ref>{{Cite web |last=Stec |first=Albert |date=2022-06-12 |title=What is CAPTCHA and How Does It Work? |url=https://www.baeldung.com/cs/captcha-intro |url-status=live |archive-url=https://web.archive.org/web/20221101005730/https://www.baeldung.com/cs/captcha-intro |archive-date=1 November 2022 |access-date=2022-11-01 |website=Baeldung on Computer Science |language=en-US}}</ref> Newer CAPTCHAs look at the user's behaviour on the internet, to prove that they are a human.<ref>{{Cite web |date=November 1, 2022 |title=What is a CAPTCHA? |url=https://www.cloudflare.com/learning/bots/how-captchas-work/ |url-status=live |archive-url=https://web.archive.org/web/20221027061629/https://www.cloudflare.com/learning/bots/how-captchas-work/ |archive-date=27 October 2022 |access-date=November 1, 2022 |website=Cloudflare}}</ref> A normal CAPTCHA test only appears if the user acts like a bot, such as when they request webpages, or click links too fast.
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