Malware, short for "malicious software" is a program, file, or code created with the intent to inflict harm on a user's computer or network. "Malware" is term that comprises many other forms of malicious software including viruses, Trojans, adware, spyware, ransomware, etc., all named for their intent. For example, spyware "spies" on victims to steal personal information. Viruses spread by making copies of themselves. Adware is harmful software embedded in electronic advertisements.