What Is a CAPTCHA?
Many people have seen them and used them, but they don't understand what a CAPTCHA is. What is a CAPTCHA anyway?
First of all, CAPTCHA is not a word. Instead, it is an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart."
It is a program that protects websites by generating tests that only humans can pass. CAPTCHAs prevent automatic form submissions. For example, only humans and not computers can read distorted text or numbers.
CAPTCHAs prevent automatic form submissions. For example, only humans and not computers can read distorted text or numbers that users are asked to type to prove it is human activity. The letters or digits come from a distorted image that appears on the screen that only humans can understand.
If at first, the CAPTCHA is not successful, a person can try another image until he is successful.
CAPTCHAs are not limited to letters and numbers. CAPTCHAs may also include other tests. One might have to identify an object that does not belong in a particular set of objects, locate the center of a distorted image, or identify distorted shapes.
While the first choice for a CAPTCHA is visual, there is another way to prove someone is a human. If a person cannot see the CAPTCHA, he can use the audio device that has been provided.
CAPTCHAs Are Useful
CAPTCHAs weren't designed to make people's lives miserable. They are useful. The test is supposed to be simple, but sometimes they are difficult to read. Sometimes it takes at least three tries to prove that a person is human. Then the audio is difficult to hear and understand. Often this getting the CAPTCHA is time consuming.