Unverified50% confidenceFactExact time
CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a common means of preventing automated programs from abusing forms and interfaces; typical implementations include Google reCAPTCHA and Cloudflare Turnstile, and its core principle is to distinguish real human users from scripted programs through image recognition, behavioral feature analysis, or interactive challenges.
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Long-term
Relevance
10/12/2026
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