Worms are also computer viruses that are self-propagating. We can say that a worm is a computer virus, and they have tendency to regenerate for in order to wreck more havoc on the affected system. It can use all of a computer's resources and shut it down.
Viruses are programs or codes that is loaded in the computer with the aim of creating a disruptive situation in the operations of the system. It has the tendencies to replicate itself. Therefore virus has a very destructive tendencies.
Spyware is a program that can follow your actions and your internet use. It can access your passwords, your key words and what ever you typed on your computer, or it is a program which can gather information about your internet usage, just for advertising purposes.
It usually gathers information from the user and transfers it to some other user in the background. It can take information from e-mail addresses. It gathers information for commercial purposes and its major tasks include; delivery of unwanted advertisements, theft of personal information, supervising Web-browsing activity for marketing purposes and transmission of HTTP requests to advertising sites.
Adware is also a type of spyware that follow the users browsing patterns and then transfer them to advertising companies, just for marketing and it noticable when a sudden pop adverts interupts during systen usage. Computer hacking is a common problem that occurs everyday, and it is due to the activities of spywares or viruses that steals all private information without permission and also it is very costly to manage.
