Captcha
From Bibliotheca Anonoma
Definition[edit]
A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge‑response mechanism used to differentiate human users from automated bots.
Common Types[edit]
- Distorted text entry (classic CAPTCHA)
- Image selection (e.g., "select all squares with traffic lights")
- reCAPTCHA v2/v3 by Google
- hCaptcha, an open alternative
Purpose[edit]
CAPTCHAs help prevent spam, automated account creation, and Ban evasion by requiring human interaction.
