What is CAPTCHA and Why IT is used


When we go to any website to create an account or write a comment in a blog, then you see some scrabble words that you have to type by looking at and they are called CAPTCHA.

Almost everyone of us would have typed this before using the Internet, but do you know what they are and why are they used?

CAPTCHA is basically a program that prepares tests and grades that can pass only humans but not computers. For example, humans can read disorderly text shown below, but can not read existing computer programs.


In simple words, CAPTCHA is a word verification test that only humans can read and confirm. But any computer-generated program can not read it and can not verify it.


Why CAPTCHA was developed?

Generally there are several spam programs for the purpose of increasing rank in search engines, which automatically gives a comment to a blog. Apart from this, many companies like Yahoo, Microsoft offer free email service.

A few years ago, many of these services were called “boats” suffering from a particular type of attack and automatic sign-ups were done for thousands of email accounts.

Therefore CAPTCHA was developed for more security needs.


To block spam comments in blogs –

Using CAPTCHA, only humans can enter comments on a blog.

Using Website Protecting – It ensures that only a person can make the registration and prevent the misuse of the automated program.

Online Polls – Can Any Online Survey Results Be Reassured? Unless it is confirmed that only humans can vote.

Prevention of Directory Attacks – It is used to prevent directory attacks in the password system.

Search engine bots – Do not enter the bots in the web site; It is needed to be truly guaranteed.


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