reCAPTCHA is a free service that protects your website from spam and abuse. reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site. It does this while letting your valid users pass through with ease.
Note: You will not see the reCAPTCHA challenge when logged in as an authenticated user. To test the web form with reCAPTCHA enabled, log out or enable your browser's privacy mode.