CAPTCHA stands for “Completely Automated Public Turing test to tell Computers and Humans Apart.” It is a type of challenge-response test that is used to determine whether a user is human or a machine.
CAPTCHAs are designed to prevent automated software or bots from performing certain actions on a website, such as creating fake accounts, submitting spam messages, or making unauthorized purchases.
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The most common type of CAPTCHA involves displaying distorted text or images that are difficult for machines to read, but relatively easy for humans to decipher. Users are required to enter the correct characters or answer a question based on the image in order to prove that they are human.
Other types of CAPTCHAs include audio challenges, where users have to listen and enter a sequence of spoken numbers or letters, or puzzle-based challenges, where users have to solve a visual puzzle to prove that they are human.