What is captcha?
First of all, we need to know about the full form of
captcha.
CAPTCHA = completely automated public Turing
test to tell computers and humans apart.
By using captcha we can secure our websites
and accounts. We can face during captcha some different letters and different
shapes letters whose computers can’t perform but humans perform perfectly.
How it's work
The letters are distorted so that machines and computers are not likely to be able to identify them. To pass the test, users (Humans) have to interpret the distorted text, type the correct letters into a form field, and submit the form. If the letters don't match, users are prompted to try again. Such tests are common in login forms, account signup forms, online polls, and e-commerce checkout pages. Also, CAPTCHA is related to AI (Artificial Intelligence).
Types of CAPTCHA
- Text
- Images
- Voice
- Symbols
CAPTCHA services providers
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