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CAPTCHA, the short form of Completely Automated Public Turing test to tell Computers and Humans Apart is essentially a sort of test that recognizes whether the user is a computer or a human being. It comes under the trademark of Carnegie Mellon University. For more information, you can go to http://www.protectwebform.com/. A CAPTCHA requests the user to take a test. Any user who provides the correct answer is considered to be a human. A very common instance of a CAPTCHA is to ask the user to key in letters from a distorted image. The sequence includes alphabets and numbers. If the user keys in the correct sequence, he is considered to be a human or else a machine. A smart CAPTCHA is pretty easy to implement. You can get the details from http://www.protectwebform.com/smartcaptcha. Most website owners opt for a function wherein the visitors can send in their feedback without allowing spammers to barge in. The moment you post your email id on the net, you can rest assured of the attack from the spammers. Automated programs that are better known as bots have the ability to scan your website and parse out your mail id. The spammers use the email ids for many purposes without your knowledge or permission. If you want to keep bots from getting your information, consider a CAPTCHA. Once you put the CAPTCHA online, as someone wants to sign up to get access to your information they will have to type in the letters that are being shown in a distorted image (i.e. http://www.protectwebform.com/plugin_wordpress). If they can't, CAPTCHA knows they are a computer and will turn them away. CAPTCHA has become very popular in the past few years because it is a program that can create tests which only humans can clear. Since the program is fully automated there is virtually no chance of any human intervention. No wonder, most website owners go for it. The key to CAPTCHA is using it to stop spammers before they ever get access to your email. Once they have it, you have lost the game and they will be regularly sending you spam emails you don't want. CAPTCHAs not only prevent encroachment by spammers for commercial purpose, it also protects the systems that are gullible to spam like, the webmail services of Gmail, Hotmail, and Yahoo. They also help prevent automated postings on online blogs. There are some services which might allow automated use but within a limit. In such a scenario CAPTCHA helps in enforcing a usage policy and prevents any kind of deviation from the policy. There are others out there that claim to do what CAPTCHA can do. They have created similar programs that ask varying questions to allow someone to get into a site or sign up for a blog. None of them are as reliable as CAPTCHA because with a database, any of the other programs questions could be answered, while the CAPTCHA image recognition system is foolproof.
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