CAPTCHA - Wikipedia, the free encyclopedia

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  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home/gregvana/public_html/blog/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home/gregvana/public_html/blog/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home/gregvana/public_html/blog/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home/gregvana/public_html/blog/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home/gregvana/public_html/blog/includes/unicode.inc on line 291.
  • : preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /home/gregvana/public_html/blog/includes/unicode.inc on line 291.

initialism for "Completely Automated Public Turing test to tell Computers and Humans Apart", trademarked by Carnegie Mellon University) is a type of challenge-response test used in computing to determine whether or not the user is human.