The vast majority, however, are installed by some action from a user, such as clicking an email attachment or downloading a file from the Internet. Others are installed by exploiting a known vulnerability in an operating system (OS), network device, or other software, such as a hole in a browser that only requires users to visit a website to infect their computers. Malware can infect systems by being bundled with other programs or attached as macros to files. There are many different classes of malware that have varying ways of infecting systems and propagating themselves. Viruses, worms, Trojans, and bots are all part of a class of software called "malware." Malware is short for "malicious software," also known as malicious code or "malcode." It is code or software that is specifically designed to damage, disrupt, steal, or in general inflict some other "bad" or illegitimate action on data, hosts, or networks. Potentially Unwanted Programs or Applications
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