Virus, A program designed to have a detrimental effect on a computer, such as destroying data or corrupting the system. Viruses can be spread to other computers (e.g. when a user runs the program or opens the file), Worm, A program designed to spread and replicate itself across computer networks. Worms cause harm by increasing traffic across a network and overloading webservers. Worms are self-replicating, so they spread without any human interaction., Trojan Horse, A type of malware that disguises itself as a normal, harmless file or program to trick users into downloading it. The Trojan may contain any of the types of malware included in this table., Spyware, Spies on your computer activity without you knowing. This may include actively monitoring what’s happening on your screen, collecting your keystrokes (see keylogger) or stealing the data you input., Keylogger, Used to capture keystrokes input to a computer. Can be used to steal usernames and passwords., Ransomware, A type of malware that encrypts all of the files on your computer and demands that you pay a ransom for the key to unlock them. Ransomware will inform the user that their files have been encrypted and demand money through a pop up message., Rootkit, Rootkits are used to hide the presence of malware in your operating system from virus scanners. They can be used to execute files, steal information, and even remotely access or control your computer., Adware, A type of malware that causes your internet browser to display unwanted pop-up ads and takes you to pages you didn’t request. It can also change your home page and direct you to a different site whenever you open your browser.

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