Malicious software or malware is an umbrella term used to describe any type of software, program, etc. that is installed on the system without the user’s consent and knowledge. It is designed to harm or corrupt the programs, files, information, etc. on the system of the host. Computer viruses, worms, trojan horses, spyware, ransomware, scareware, adware, and other malicious programs come under the category of malware. Viruses These are the malicious programs that spread across systems and programs. They cause disruption to systems, operational problems like reduced speed, pop-up windows, crashing of devices, changes to default settings, etc., and damage the data as well as software. They attach themselves to an executable host file. Now, when the host file is opened the virus becomes active. The most important aspect of a virus is that it is able to replicate itself. Worms They do not need to attach themselves to the host files. They themselves are software that can re...