CAPTCHA— “Completely Automated Public Turing test to tell Computers and Humans Apart” – is a security feature that can prevent the use of websites that may be illegal. This is a type of test that is located on websites where every user needs to put in a series of letters and numbers or click certain parts of a picture in order to complete a task. That might be purchasing a product, registration account, log in, posting a review, or any other kind of activities. Developers use this on sites to because to make sure the being using the website is indeed a human with right intentions.
CAPTCHAs work by providing a query that is easy for a human to answer, but difficult for a bot. So most internet users will have little difficulty reading the words New Zombies. Spambots can’t answer the question right, so they are unable to submit the form, so you will only receive real form submissions. CAPTCHAs need to be continuously improved to stay smarter than the auto bots, which are also improving every time.
There are many CAPTCHA examples but the most used are mentioned below:
- Sweet Captcha
- PlayThru
- Biometric Security
- Text Message Verification
- The Honeypot Method
- Confident Captcha
- No CAPTCHA from reCAPTCHA
- Word Problem
- Time-Based
- Invisible reCAPTCHA
- Picture identification of captcha
- 3D captcha
- Ad-injected captcha
- Drag and drop Captcha
- Tic Tac Toe Captcha
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