Function and Purpose Captcha Code in each login to an account

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Purpose of CAPTCHA Used [Captcha Function]
CAPTCHA is used primarily to circumvent automated (bot) software from performing actions just as humans do sign ups or logins and so on. For example, when signing up for a new e-mail account, you'll see the CAPTCHA at the bottom of the sign-up. This is to make sure that the form can only be filled by humans instead of automated or computer bots. Try to imagine it is impossible for the bot to correctly sort the resulting CAPTCHA. If this method is not used, then the number of accounts generated by the bot increases.
The function of Captcha itself can also be interpreted to test the truth of an answer given by computer in the form of numbers and letters, the purpose of chaptcha is to distinguish whether the answer is from the computer or from humans.
CAPTCHA may be referred to as Turingback test, as it is administered by machine and intended for humans, catcha also serves to filter and filter and reject crime forms in cyberspace, especially in the testing of passwords and virus and scam filtering on a website, site or e-mail.
CATPCHA is sometimes very annoying and may cause lazy users to sign up for something. If you are a pentadbir / devoloper system, then CAPTCHA should be used because it has the ability to protect the system rather than malicious attacks where hackers / crackers will try to play your system by creating software or an automated sign up signature. For example, hackers / crackers may use automated software to generate a certain quantity of accounts, possibly even an infiniti number, causing a very high load on the target waiter. This indirectly decreases the quality of a particular system. This may infect millions of legitimate users and their requests.

inti'nya fungsi pokok captcha itu ..
Mencegah comment Spam
pada umumnya Pemilik web/blog/dll tidak hanya ingin komment webnya terlihat bagus dalam penampilan, kuantitas tapi tentu kualitas , tp gak tau kalo adminnya sendiri yang spam
Mencegah Spam Bot
Tau sendiri Kan bot tak bisa membaca captcha, karena string string pemrogramannya sudah tetap . tak mungkin capthca yang setiap saat berubah dapat dibaca kecuali kalau bot itu berasal dari engine Blog itu sendiri
Mencegah Flood
Siapa Yang Ingin Dia di Flood ? kecuali flood like tp kalau flood kata kata yang tidak pantas banyak lagi siapa yang mau coba ?? (Flood adalah mangirimkan data secara berulang ulang)
Melindungi Pendaftaran Email / User (khusus webmail)
Dulu Pernah Kejadian Yahoo dan google diserang semacam robot yang mendaftar email ampe ribuan! kebayang gak? ribuan mail palsu , pasti om google dan mpok yahoo marah.

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