CAPTCHA is a type of challenge–response test used to determine whether the user is human or not.
It generates and grades tests that humans can pass but current computer programs cannot.
reCAPTCHA is a program that protects websites against bots by using an advanced risk analysis engine and adaptive challenges.
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A CAPTCHA ( / ˈ k æ p . tʃ ə / KAP -chə , a contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart" ) is a type of challenge–response test used in computing to determine whether the user is human
CAPTCHA - Wikipedia
A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot. For example, humans can read distorted text as the one shown below, but current computer programs can't: The term CAPTCHA (for Completely
The Official CAPTCHA Site
What is reCAPTCHA?
reCAPTCHA protects your website from fraud and abuse without creating friction.
reCAPTCHA uses an advanced risk analysis engine and adaptive challenges to keep malicious software from engaging in abusive activities on your website.
CAPTCHA is a security test given to prevent computers from filling out forms on the Internet. Learn more about How CAPTCHA Works.
How CAPTCHA Works | HowStuffWorks
While most of the time this is a quick step before you can continue your activity, many people wonder what a CAPTCHA is? And what is its purpose?
What is Captcha? - Panda Security