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en.wikipedia.org/wiki/CAPTCHA

A CAPTCHA is a type of challenge-response test used in computing to determine whether or ..... Sometimes, if part of the software generating the CAPTCHA is client-side (the validation is done on a server but the text that the user is required to ...

www.qualtrics.com/support/survey-platform/survey-module/editing-questions/question-types-guide/advanced/captcha-verification

Captcha Verification (or Completely Automated Public Turing Test to tell Computers and Humans Apart) is a common web technique used to help ensure that ...

www.captcha.net

A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot.

help.yahoo.com/kb/SLN2662.html

Yahoo uses CAPTCHA verification to protect against spam or other unauthorized account access. By selecting the correct images, you verify you're human and ...

www.aece.ro/helpdesk/knowledgebase.php?article=73

Nov 19, 2011 ... Question. The system always shows the error of "CAPTCHA verification failed" while the code is right. What is the problem? Solution. First of all ...

www.google.com/recaptcha

reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site.

support.google.com/recaptcha/?hl=en

Helping everyone, everywhere, one CAPTCHA at a time; Security Help .... reCAPTCHA checkbox checked after successfully completing a verification challenge.

www.ask.com/youtube?q=Captcha+Verification&v=5ge3vM4JjLg
Sep 30, 2016 ... In this video we will discuss about captcha verification (completely automated public turing test to tell computers and humans apart.) how it ...

www.dictionary.com/e/captcha

Wherever we go on the internet, we encounter CAPTCHAs, those twisted words that block or enable entries on websites. Need to post an ad on Craigslist?