I am doing a business site for a web company, and was wondering if Captcha has become so well-known, that it no longer needs an explanation ?
Right now there is only a input box, the captcha image and a headline saying "Captcha". But should we put in an explanation, just to be safe ?
The client is against an explanation, since the design is very clean.
But how many people do you believe are familiar with Captchas now-a-days? (both with and without our target audience taken in perspective.)