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.)
Answer
I have found that most web literate users are familiar with the concept of a CAPTCHA, but most are not familiar with the term "CAPTCHA". Even my parents (who are not web savvy) understand the idea of "enter these characters to prove you're a human" -- however, they wouldn't understand the headline. I would recommend something more straightforward: "Please enter the following characters".
As an aside, please be absolutely sure you need a CAPTCHA at all! There's a lot of research which proves that they dramatically impact both the ease of use and conversion rates. See the following:
Be sure to see this related question on StackOverflow.
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