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Antivirus or anti-virus software (often abbreviated as AV ), sometimes known as anti-malware software, is computer software used to prevent, detect and remove malicious software .
Antivirus software was originally developed to detect and remove computer viruses , hence the name. However, with the proliferation of other kinds of malware , antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from: malicious Browser Helper Objects (BHOs), browser hijackers , ransomware , keyloggers , backdoors , rootkits , trojan horses , worms , malicious LSPs , dialers , fraudtools , adware and spyware . Some products also i
Although the roots of the computer virus date back as early as 1949, when the Hungarian scientist John von Neumann published the "Theory of self-reproducing automata" , the first known computer virus appeared in 1971 and was dubbed the " Creeper virus ". This computer virus infected Digital Equipment Corporation 's ( DEC ) PDP-10 mainframe computers running the TENEX operating system.