- CAPTCHA = Completely Automated Public Turing test to tell Computers and Humans Apart
- It helps protect websites from spam and abuse.
| Type | Example |
| CAPTCHA |  |
| reCAPTCHA |  |
| reCAPTCHA v2 (no CAPTCHA reCAPTCHA) |
 |
| reCAPTCHA v3 |
Providers
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