What is Captcha?

CAPTCHA is an acronym for ‘Completely Automated Public Turing test to tell Computers and Humans Apart.’

Some websites use reCAPTCHA technology during the checkout phase as a means of preventing software from automating this process. It is a free service provided by Google to protect websites from spam and abuse from automated software by using an advanced risk analysis engine and adaptive CAPTCHAs, letting valid users (humans) pass through easily.