What is up with those security code things that are always funny looking letters and numbers?

Like when you are filling out something online, it will ask you to type in the security thing. and it is so hard to read! what is this for?What is up with those security code things that are always funny looking letters and numbers?
It's called 'captcha'. The idea is that a human being can interpret the distorted letters but it's very difficult to write a program which can. That prevents people from writing automatic programs to go create thousands and thousands of accounts.What is up with those security code things that are always funny looking letters and numbers?
THEY ARE SO THAT A COMPUTER HACKER CANNOT GET INTOP THE SYSTEM AS EASY. COMPUERS CANNOT READ IT!
This feature is called: CAPTCHA


A CAPTCHA (an acronym for ';completely automated public Turing test to tell computers and humans apart';, trademarked by Carnegie Mellon University) is a type of challenge-response test used in computing to determine whether or not the user is human. The term was coined in 2000 by Luis von Ahn, Manuel Blum, and Nicholas J. Hopper of Carnegie Mellon University, and John Langford of IBM. A common type of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test. This term, however, is ambiguous because it could also mean a Turing test in which the participants are both attempting to prove they are the computer. So basically the main purpose is to stop hackers, and spammers OR automated computers (AKA: bots) from easily joining multiple times to a website or entering a website to gain access easier.
it keeps away hackers apparantly
It keeps ppl from making voluminous amounts of accounts for various reasons. Yea, and I've heard it stops hackers.
To make sure that it isn't an automated program filling out the online form, that and to keep hackers out.
It keeps automatic programs from signing in or up to keep out hackers.
its a tool to eliminate people like you from participating...