What is Malware, Malware -short for MALicious softWARE- is a term used to broadly classify a form of software which is installed in a computer system mostly without the owners permission with malicious intentions. It includes Trojans, viruses, key loggers, malicious active content, rogue programs and dialers among others.                    

Every day, adversaries attempt to invade your networks and infect your computer with viruses, spyware and other malware. All too often, these attacks succeed, and frequently without you knowing about it. In other cases, you open the door to malware by visiting infected Web sites, opening e-mail attachments, or running macros that contain viruses.
 

Once inside a computer, a malware outbreak can spread with alarming speed via  networks to compromise or destroy critical data or personal information, and leave your computer open to new attacks. Some of the stealthiest malware even allows intruders to secretly conduct their nefarious business over long periods—using your computers!.