Captcha, a mark meaning ” Fully automated public Turing test to distinguish computers from humans or, in English, Fully Automated Turing’s Public Test to Distinguish Computers from Humans” is a security feature designed to prevent robots from accessing or submitting data to websites. Captchas work by presenting users with a challenge that is difficult for machines to solve but easy for humans to understand.
The most common type of captcha is to display garbled or garbled characters that the user can decipher and type correctly in a text field. This challenge is called a “visual” captcha and is designed to test the user’s ability to recognize letters and numbers.
Randomly decrypted images that are machine unreadable
The captcha generation process involves a combination of software and algorithms that create random, distorted, or otherwise obscured images of text or other symbols. These images are usually generated in a way that is difficult for computer algorithms to recognize, but still human-readable.
When a user sends a captcha response, the website server validates the response to ensure it is correct. If the answer is wrong, the user is prompted to try again until they give the correct answer.
Or even audio or visual captchas
More challenging captchas may also contain audio or visual challenges that are more difficult for machines to solve. For example, an audio captcha might ask users to identify a spoken word or phrase, while a visual captcha might ask users to identify objects or patterns in an image.
Overall, captchas play an important role in website security by preventing bots from accessing websites or sending data to websites. Although they can be frustrating for users, they are a necessary tool in the ongoing fight against automated web attacks and spam.