• Once the virus is activated, it can spread
throughout and may damage files and system
software, including the operating system.
• Viruses spread when the file they are attached
to is transferred from one computer to
another using the network, pen drive, disk, or
infected e-mail attachments.
• A program that, when executed, replicates by
inserting copies of itself into other programs,
data files, or the boot sector of the hard drive.
• Most viruses are attached to an executable
file, which means the virus may exist on a
system but will not be active or able to spread
until a user runs or executes the host file or