a word which has a combination of small, big letters and numbers. usually these can be used at yahoo messenger when your chatting, before you can enter a chat room and also when you're signing up to a website, which they used this security code to be type before you can proceed.
It is what we called verification codes. These Captchas are used to prevent spamming. These are combination of different characters, may be letters or numbers or even symbols. Usually used by different sites to verify an email address of person. Sites such as yahoo, google, hotmail, friendster, myspace, multiply, etc use captchas.
knol is an collerative dictionary. here is knol dictionary where every word, sentence or situation may have definition. wellcome to knol dictionary!
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