Captcha is used for

Asked in GPSC Prelims CSP 2 2017 · Topic: Cyber Security and Cyber Crimes (Cyber Security Technologies and Countermeasures: Firewalls, Intrusion Detection/Prevention Systems (IDS/IPS), Encryption, VPNs, Antivirus, Multi-factor Authentication)

1. Encrypting passwords
2. Steganography
3. Checking for bots
4. Captures images

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