We have already said that a computer virus is an executable program code. Because a virus is a computer program, it cannot do anything unless it is executed, for this reason the virus program writers make these virus programs to infect some executable program, or some executable part of the drive such as MBR, DBR etc.
When the infected program or the infected MBR, DBR etc, is executed the virus will also be executed with it, providing a chance for the virus to become active.
A virus can never spread if you copy the data file from one infected floppy or hard disk drive and use it on some other clean system. On this type of situation only chance of infection comes if the data file contain some macro and is infected with macro virus.
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