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CAPTCHA

Security

Rate Limiting Brute‑Force Attack Bot Detection Botnet

Bot mitigation challenge-response mechanism.

Definition

CAPTCHAs are challenge-response systems designed to increase the cost of automation, often combined with risk scoring and rate limiting.

In plain English Bot mitigation challenge-response mechanism.

Why this matters

Why it matters: They reduce automated abuse but can create usability and accessibility trade-offs.

Example

Example: Risk-based CAPTCHA triggered after suspicious login patterns.