Many people use  internet for many purpose like professional, social and personal activities. But there are also hackers  who try  to damage our Internet-connected computers and pcs, violate internet privacy and render Internet services incompitency.

Given the history of existing attacks as well as new threats and more destructive future threats, security concern has become a central discussion  in the field of IT

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Malware – reffers to  malicious software which are  designed to disrupt, damage, or gain unauthorized access to a computer system and networks.  Malware out there  is self-replicating and from the newly infected host, it seeks entry into yet more hosts. In this manner, self-replicating malware can spread very fast.

Virus – Is a software designed which requires  form of user’s interaction to infect the user’s personal computer. The good example is an e-mail containing malicious executable codes. If a user receives and opens such an malicious codes, the user  runs the malware on the device.

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Worm – It is  malware which can enter a computer or personal computer without user interaction. Example user may be running a vulnerable network app  to which an hacker can send malware. In some scenarios without any user interference.

Botnet – A network of private computers infected with malicious software and controlled as a group.

DoS (Denial of Service) – A DoS attack renders a network, host, or other pieces of infrastructure unusable by legitimate users.

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