Computer viruses spread from computer to computer just by attaching themselves to files or boot records of disks and diskettes.
These days viruses is not uncommon to find them in e-mail attachments and other programs that can be downloaded from the Internet.
A virus is a relatively passive agent that can travel from one file to another file on the same computer if the infected file is executed, from computer memory to a file on disk, on a disk that is carried from one computer to another (some companies prohibit floppy drives, thereby preventing users from copying information onto their computers), on e-mail attachment executable files, and over a modem or network connection.
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