A computer program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites. It is generally used to check whether you are a robot or a uman being. There are two basic alternatives on how to generate the content of the captcha Submit a string that should be used Automatically generate a random string. If this alternative is chosen then the user of the library should save the created string and compare it to what the user enters. CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha . Add some control in web form .. take 2 button control one button control is used to generate random captcha code and second one is used t...
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