Definition: A captcha is a distorted image of letters and numbers used to prevent automated use of websites; Anything that a human must do to prove that they are not a computer. Captchas are most frequently used in submission forms.
There are a lot of different types of Captchas around, some accessible and some not. A good accessible Captcha goes by the name of reCaptcha: an important element is that it has an auditory component in it to help a visually impaired person to submit the web form. Screen readers cannot recognize a displayed distorted text. In order to enable this Captcha for your website, you will need to go to http://www.recaptcha.org and sign up for a free account. You will be presented with both a Public Key and a Private Key which are to be used with your reCaptcha code, or in a reCaptcha enabled plugin. Don’t worry, there are plenty of code snippets and tutorials on the website to help you out.
Below is an example of a form which would be considered accessible, created by Gravity Forms.
Note: Gravity Forms currently has an accessibilty issue with both checkboxes and fieldsets. If at all possible, find an alternative for these.
Using Gravity Forms
In order to enable this type of form for your WordPress site, you will have to contact the Web Office and ask to have Gravity Forms enabled for your WordPress website.
If you have questions about creating a form with Gravity Forms, feel free to contact the Web Office for help.