Antivirus (anti-virus) software is a class of program that will prevent, detect and remediate malware infections on individual computing devices and IT systems.
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The label "antivirus" was originally given to programs that identified and removed a particular type of malware called a virus. Today, however, antivirus programs are useful for preventing infections caused by many types of malware, including worms, Trojan horses, rootkits, spyware, keyloggers, ransomware and adware.
In marketing, the terms antivirus and antimalware are often used as synonyms.