Short for “malicious software,” malware refers to software programs designed to damage or do other unwanted actions on a computer system. Common examples of malware include Viruses, Trojan Horses, and Spyware. Viruses, for example, can cause havoc on a computer’s hard drive by deleting files or directory information. Spyware can gather data from a user’s system without the user knowing it. This can include anything from the Web pages a user visits to personal information, such as credit card numbers.