These days, we see a lot of captcha images when registering new accounts on web sites, writing blogs or even sending out messages from webmail. We are required to retype the characters printed in the images.
A captcha (an acronym for "completely automated public Turing test to tell computers and humans apart") is a type of challenge-response test used in computing to determine whether or not the user is human. A common type of captcha requires that the user type the letters of a distorted and/or obscured sequence of letters or digits that appears on the screen. Only human can read the image and therefore it successfully prevents bots or machines to perform automated registration.
Some people are not happy that captcha wastes their time. Please be considerate. If we want to reduce the amount of spam on the Internet, we have to live up with captcha.
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