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What is CAPTCHA? Why does it appear?

CAPTCHA , If you are using internet these days then you are quite familiar with this word .when  a domain name is searched then it redirects into CAPTCHA where it says to prove ourselves as "human" and it is generally seen while creating an account or booking tickets etc., These days CAPTCHA can be seen asking us to recognize street signs,mountains,stores,etc.,

What is CAPTCHA?
It stands for "Completely Automated Public Turing test to tell Computers and Humans Apart". It's all big words but what does it mean ? It says that when we type a search related term server tries to make sure that you are not a robot and you are  human  .

Image result for CAPTCHA

How does it work?
         In this case when it asks us to prove that we are humans it doesn't mean that robots with the growing AI can't even figure out the couple of street signs .Yes they can figure it out, but here the robots means the bots or the bugs that can steal our data.
          Let me explain clearly in this modern world privacy everything and there lots of scammers who are trying to make data public by hacking into a website .So, when we try to create an account into a website the bot which already resides in the traffic can get into servers by the gateway we created for it by giving our personal info to it to login into that website and later on leak all other users data.
         So, basically the captcha decides that there is no bot trying to enter into the servers apart from the user thus making it a little process to search something in the internet sometimes.

First CAPTCHA was created was LEETSPEAK 133755P34K in 1980's to confuse the bots and be more secure and later on ALTARISTA in 1990 ,this puts barrier using optical character recognition to prevents bots or spam and for the visually impaired people there is audio captcha for help.

Why does CAPTCHA appear when we use VPN?
         If you are using a shared IP address on a VPN, this means that you are not the only person using that IP address and that other people are using it as well. Therefore, you are likely not the only person that is doing searches on Google.com. These other people are likely to be searching Google at the same time as you are doing it.
       What Google sees is a lot of searches that originate from the same computer which is something that is commonly done by bots and spammers. Because of this, Google requests that you verify that you are a human by requesting that you complete a Captcha occasionally. This will prove to Google that you are not a computer program that is making fake searches.
        
Now-a-days we can see with growing AI and Machine Learning that the bots have gained a lot of potential to get through Captcha and we have seen several complaints of server crashes and user data leaks but the companies like Google is working on a new thing where we see only a box to click on to prove that we are not robot and this works through the user mouse movements are tracked by the system and gives him entrance because the bots can do the imperfect ways of moving mouse cursor as a human does thus providing saftey with a click of a button.

Image result for CAPTCHA

Are we Safe?
      Apart from we are doing everything on Google is a bit of question mark when it comes to privacy , but it is reliable as it make sures our IP addresses are hidden .


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