Captcha is used check the user is human or system. Some programmers write code such that it automatically fills the data into the contact us form and registration forms. Which will impact the administrator to find out genuine records from existing. In order to stop spam and unwanted data.
Captcha is human readable text to entered into the box then it will consider you as a human rather than a program.ReCaptcha is the one of the best and strong captcha to stop spam it is quite difficult to crack the words in it.
Features of ReCaptcha are :
- Open Source
- Most Secure
- Easy to Integrate
- Used in wide range of websites
- Good Color Combinations
Get more details by visiting the ReCaptcha Link from above.