Malware—a blanket term for viruses, worms, trojans, and other harmful computer programs—has been with us since the early days of computing. But malware is constantly evolving and hackers use it to wreak destruction and gain access to sensitive information; fighting malware takes up much of the day-to-day work of infosec professionals.
Malware is short for malicious software and, as Microsoft puts it, "is a catch-all term to refer to any software designed to cause damage to a single computer, server, or computer network." In other words, software is identified as malware based on its intended use, rather than a particular technique or technology used to build it.
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