A computer virus is an executable
program. Depend on the nature of a virus, it may cause damage of your hard
disk contents, and/or interfere normal operation of your computer. A virus
might corrupt or delete data on your computer.
By definition, a virus program is
able to replicate itself. This means that the virus multiplies on a computer by
making copies of itself. This replication is intentional; it is part of the
virus program. In most cases, if a file that contains virus is executed or
copied onto another computer, then that computer will also be
"infected" by the same virus.
A virus can be introduced to a
computer system along with any software program. For Internet users, this
threat can come from downloading files through FTP (file transfer protocol), or
referencing email attachments.
When a virus is introduced to a
computer system, it can attach itself to, or sometimes even replace, an
existing program. Thus, when the user runs the program in question, the virus
is also executed. This usually happens without the user being aware of it.
A virus program contains
instructions to initiate some sort of "event" that affects the
infected computer. Each virus has an unique event associated with it. These
events and their effects can range from harmless to devastating. For examples:
·
An annoying message appearing on the
computer screen.
·
Reduced memory or disk space.
·
Modification of data.
·
Files overwritten or damaged.
·
Hard drive erased.
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