CAPTCHA! Here's everything you need to know about it
CAPTCHA or Captcha (pronounced as cap-ch-uh) which stands for “Completely Automated Public Turing test to tell Computers and Humans Apart” is a type of challenge-response test to ensure that the response is only generated by humans and not by a computer. You go to a website. You decide to sign up for a new account there. You’re taken to a screen where you meticulously enter your details, making sure you don't leave out any required fields (or else you’ll have to retype your password… twice). And right before you are allowed to hit “Submit” you see the final challenge of registering for something online– a box with some strange symbols all jumbled up (possibly incomprehensible upon first glance) with the instructions “type what’s in the box.” It's not a new scenario– in fact, it’s probably something most people have had to deal with online since Captcha really got kicked off in the late 90s. In general, a Captcha is a challenge-response test that is designed t...