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  1. CAPTCHA - Wikipedia

    CAPTCHAs do not have to be visual. Any hard artificial intelligence problem, such as speech recognition, can be used as CAPTCHA. Some implementations of CAPTCHAs permit users to …

  2. reCAPTCHA | Google for Developers

    reCAPTCHA v3 helps you detect abusive traffic on your website without user interaction. Instead of showing a CAPTCHA challenge, reCAPTCHA v3 returns a score so you can choose the …

  3. How CAPTCHAs work | What does CAPTCHA mean? - Cloudflare

    What is a CAPTCHA? A CAPTCHA test is designed to determine if an online user is really a human and not a bot. CAPTCHA is an acronym that stands for "Completely Automated Public …

  4. CAPTCHA: What It Is, How to Solve It, and Why It Matters

    Feb 11, 2025 · In simpler terms, it's a test designed to determine whether the user is a human or a bot. Websites use CAPTCHA to prevent spam, protect against automated attacks, and …

  5. What is CAPTCHA? - IBM

    CAPTCHA stands for "completely automated public Turing test* to tell computers and humans apart." It refers to various authentication methods that validate users as humans, not bots, by …

  6. What is CAPTCHA code - GeeksforGeeks

    Jul 15, 2025 · CAPTCHA is a strategy used to ensure sites against spam. The objective is to prevent intuitive sites from being spammed by sifting through naturally created input. The …

  7. What Is CAPTCHA? Meaning, Definition, Types & Uses | Fortinet

    CAPTCHA (Completely Automated Public Turing Test To Tell Computers and Humans Apart) is a system designed to differentiate between human visitors to a website and robotic agents. …

  8. CAPTCHA: Meaning, Types & How They Work - Okta

    Sep 14, 2024 · We've all encountered CAPTCHA at least once as we've scrolled through websites and attempted to fill out forms. Anything that involves solving a puzzle or passing a …

  9. What is a CAPTCHA & How CAPTCHAs Work - DataDome

    Jun 2, 2025 · Want to know what a CAPTCHA is & how it works? Learn about the origin of CAPTCHAs, what they do & why they can't stop advanced bots.

  10. CAPTCHAs 101: what they are, how they work, and where they fall …

    Jul 1, 2025 · CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. As the name suggests, it’s a challenge designed to separate human users …