Malware, umbrella term used to refer to

Malware, short for malicious software, is an umbrella term
used to refer to a variety of forms of harmful or intrusive software, including
computer viruses, worms, Trojan horses, ransomware, spyware, adware, scareware,
and other malicious programs. It can take the form of executable code, scripts,
active content, and other software.

Types of Malware:

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·       
Adware

The term adware is frequently used to describe a form
of malware which presents unwanted advertisements to the user of a computer.
The advertisements produced are usually pop-ups or unlosable windows.

·       
Spyware

Spyware is malware which aims to gather information
about users without their knowledge.

·       
Virus

A virus is a type of malware replicates itself and
modifies or deletes file on the infected device.

·       
Worm

A computer worm is a standalone malware computer
program that replicates itself in order to spread to other computers. Often, it
uses a computer network to spread itself. Worms almost always cause at least
some harm to the network, even if only by consuming bandwidth, whereas viruses
almost always corrupt or modify files on a targeted computer.

·       
Trojan

Trojans are malware disguised as a different file. For
example they could be spread by an email attachment that looks unsuspicious,
leading the users into opening it because it has been disguised. Many trojans
act as a backdoor, contacting a controller which can then have unauthorized
access to the affected computer. Trojans may allow an attacker to access users’
personal information. It can infect other devices connected to the network.
Ransomware attacks are also often carried out using a Trojan.

·       
Scareware

Scareware usually scares users into buying or clicking
an item in which could infect their device with other malware. Another approach
is to trick users into uninstalling legitimate antivirus software or disabling
their firewall.