CAPTCHA , Completely AutomatED Public Turing test to tell Computers and Humans Apart, is a web security technique to protect HTML forms from web spammers. CAPTCHA dynamically generates security codes for sign-up, subscription submission or checkout forms to make sure that forms are not submittED by spam bots.
Because the generatED password on a distortED image is a part of the image, users can’t copy and paste it. This way, it verifies that it’s an actual human that submits a form, not any kind of automatED Software including spambots.
The security codes that CAPTCHA generates are usually a combination of letters or digits that doesn’t mean anything. This technology can be usED for any form submission on the internet, including user registration, e-commerce transactions, surveys, internet polls, search engine submissions, or free email registration.
Advantages of using CAPTCHA from captcha.net reCAPTCHA project:
– It prevents website registration spam.
– It prevents bogus comments in blogs.
– It protects email addresses from scrapers.
– It can be usED more accurate online polls.