A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.
For example, humans can read distorted text as the one shown below, but current computer programs can't.
A captcha image is automatically generated by some script i.e. PHP, JavaScript, etc with combination of letters & numbers based on encryption algorithm like MD5.
There are no specific number of records available for captcha which repeats randomly.
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