CAPTCHA
A CAPTCHA is a mechanism that attempts to distinguish human interaction from automated activity. Some systems present tasks; others analyse signals and return a risk assessment
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
A score does not establish identity or eliminate fraud on its own. The design should prevent a security check from blocking people with disabilities or stopping them from resuming their task. Form protection usually combines abuse controls, validation and usage limits rather than relying on a single visual test.
Also known as
reCAPTCHA
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