Why we are using captcha and how it works

Hello friends today, let's take short drive with CAPTCHA, why it is used, and its short history.
So let's get into it..

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What is captcha?
When you make email account or buy any ticket online, you have to pass a test.
For you, the test should be simple and easy. But for a computers, the test should impossible to solve.

This sort of test is a CAPTCHA, that stands for Completely Automated Public Turing Test to Tell Computers and Humans Apart. They're also known as a type of Human Interaction Proof (HIP).

You may have seen CAPTCHA tests on lots of Web sites. The most common form of CAPTCHA is an image of several distorted letters. It's your job to type the correct series of letters into a form. If your letters match the ones in the distorted image, you pass the test.

A short history of captcha

Captch is an inception from hacker community.
Hacher use a technique to post sensitive text in online chat forums. Which can't be filtered or picked up by lurking authorities. For Example, they devised a method of conversation which converted words to look-alike characters. An example is HELLO to |-|3||().

Why is it so necessary ?

It's because of people trying to compromise the system -- they want to find loopholes in the computers running the site. While these individuals probably make up a minority of all the people on the Internet, their actions can affect millions of users and Web sites. For example, a free e-mail service might find itself bombarded by account requests from an automated program. That automated program could be part of a larger attempt to send out spam mail to millions of people. The CAPTCHA test helps identify which users are real human beings and which ones are computer programs.

One more interesting thing about CAPTCHA is that the people who design the tests aren't always upset when their tests fail. That's because for a CAPTCHA test to fail, someone has to find a way to teach a computer how to solve the test. In other words, every CAPTCHA failure is really an advance in artificial intelligence.

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Thanks for reading.