FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A Trojan must be executed by its victim to do its work. Trojans usually arrive via email or are pushed on users when they visit infected websites. The most popular Trojan type is the fake antivirus program, which pops up and claims you’re infected, then instructs you to run a program to clean your PC.

Detailed explanation-2: -A virus, on the other hand, is a type of malware. Its definition is limited only to programs or code that self-replicates or copies itself in order to spread to other devices or areas of the network. Based on the above definitions, the word malware can be used to refer to any type of virus.

Detailed explanation-3: -Malware can use known software vulnerabilities to infect your PC. A vulnerability is like a hole in your software that can give malware access to your PC. When you go to a website, it can try to use vulnerabilities in your web browser to infect your PC with malware.

Detailed explanation-4: -Worms. One of the most common types of malware, worms, spread over computer networks by exploiting operating system vulnerabilities. A worm is a standalone program that replicates itself to infect other computers without requiring action from anyone.