Stealing passwords or data, logging keystrokes, corrupting files, spamming your email contacts, and even taking over your machine are just some of the devastating and irritating things a virus can do.
However, once the virus infects your computer, the virus can infect other computers on the same network. This means that a virus can remain dormant on your computer, without showing major signs or symptoms. In order for a virus to infect your computer, you have to run the infected program, which in turn causes the virus code to be executed. Once a virus has successfully attached to a program, file, or document, the virus will lie dormant until circumstances cause the computer or device to execute its code.
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In the process, a virus has the potential to cause unexpected or damaging effects, such as harming the system software by corrupting or destroying data. A virus operates by inserting or attaching itself to a legitimate program or document that supports macros in order to execute its code.
In more technical terms, a computer virus is a type of malicious code or program written to alter the way a computer operates and is designed to spread from one computer to another. Similarly, in the same way that flu viruses cannot reproduce without a host cell, computer viruses cannot reproduce and spread without programming such as a file or document. A computer virus, much like a flu virus, is designed to spread from host to host and has the ability to replicate itself.