Zombie nation
A bot is a computer whose operation has been secretly hijacked by malware. The infected computer, which is often referred to as a "zombie," has a Trojan program which directs the computer to connect to a remote location to download additional instructions. A group of hijacked zombie computers forms a botnet.
In the second half of last year, more than six million computers in the US were taken over by infectious programs known as "botnets." The number represents an increase of 29 percent when compared with the first half of the year, according to security firm Symantec's (Nasdaq: SYMC) latest Internet Security Threat Report.
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