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Malware takes over computers without a user knowing.

Malware, short for malicious software, is any software intentionally designed to cause damage to a computer. There are different kinds of malware that can hurt computers, such as viruses, Trojan horses, spyware and ransomware. These programs can steal passwords, delete files, collect personal information, or even stop a computer from working at all. Computer security or anti-malware software is usually good at stopping malware from installing itself. When security software is not installed, malware can get into the computer. Getting rid of malware can be difficult, even when using programs designed to remove it.