What is a computer virus ?

What is a computer virus ?

Well, the best definition we have been able to come up with is the
following:

   #1 A virus is a program that is able to replicate, that is create
      (possibly modified) copies of itself.

   #2 The replication is intentional, not just a side-effect.  

   #3 At least some of replicants in turn are also viruses by the same
      definition.

   #4 A virus has to attach itself to a "host", in the sense that
      execution of the host implies execution of the virus.
More of the text here
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