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Malware is an umbrella term for software designed to harm computers. It includes viruses, trojans, worms, keyloggers, and other destructive programs.

Viruses can spread from one computer to another and encrypt user data. Ransomware can demand a ransom payment in order to decrypt user data. Some malware also disables system functions or corrupts critical OS files.

Trojans are software applications that disguise themselves as legitimate software. These rogue programs are typically designed to steal personal information and passwords. They can crash the infected device and can even spy on the activity of users.

Keyloggers record the actions of users. They can also track the websites that are visited and the emails that are sent. This information can be used for identity theft.

Spyware is a type of malware that collects information about the activities of a user without their knowledge. It can also display advertisements on the screen. The program can also monitor the download history of the user.

A rootkit is a collection of software tools that give an attacker access to a system. It can also hide itself in the operating system and give the threat actor remote control of the infected computer.

Adware is another form of malicious software. It displays banner ads and pop-ups on the infected computer. Often, adware piggybacks on a free program that the user installs in exchange for a service.

Viruses, adware, spyware, and Trojans all have different objectives. Some are malicious, while others are designed for industrial espionage. Others, like ransomware, are designed to destroy systems.