Captchas

Captchas aka Turing codes are the most wonderful invention in the cyberworld.

They are actually pictures that make it hard for computers to impersonate people.

Some websites like to put Turing Codes to deter people from using bots to cheat, some do that for security.

But the most beneficial thing about Turing codes is that computer viruses , worms and trojan horses won't have the chance to hack accounts.

Turing codes come in a variety of styles but all of them are pictures. Now the working behind this genius invention is the computers cannot read pictures but the human mind can.

Everytime Google or some other site, prompts you to type in some code when you sign up or post something, you'll be at ease because of Alan Turing and his amazing invention.