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Zend Framework 2 Documentation (Manual)

File: /_sources/modules/zend.captcha.intro.txt

.. _zend.captcha.introduction:

Introduction to Zend\\Captcha
=============================

`CAPTCHA`_ stands for "Completely Automated Public Turing test to tell Computers and Humans Apart"; it is used as a
challenge-response to ensure that the individual submitting information is a human and not an automated process.
Typically, a captcha is used with form submissions where authenticated users are not necessary, but you want to
prevent spam submissions.

.. _zend.captcha.introduction.overview:

Overview
--------

Captchas can take a variety of forms, including asking logic questions, presenting skewed fonts, and presenting
multiple images and asking how they relate. The ``Zend\Captcha`` component aims to provide a variety of back ends
that may be utilized either standalone or in conjunction with the :ref:`Zend\\Form component <zend.form.intro>`.



.. _`CAPTCHA`: http://en.wikipedia.org/wiki/Captcha