Today I’m going to talk about: Computer virus
I’ve divided my presentation into two parts:
First I’d like to introduce of this virus and second I’ll present
types of virus.
So, let’s start with introduce
Virus (computer), self-duplicating computer program that interferes
with a computer’s hardware or operating system. Viruses are designed to
duplicate or replicate themselves and to avoid detection. Like any other
computer program, a virus must be executed for it to function, it must be
located in the computer’s memory, and the computer must then follow the
virus’s instructions. These instructions are called the payload of the
virus. The payload may disrupt or change data files, display an irrelevant
or unwanted message, or cause the operating system to malfunction.Computer
viruses activate when the run programs are opened. Once a virus is active,
it may replicate by various means and tries to infect the computer’s files
or the operating system. For example, it may copy parts of itself to floppy
disks, to the computer’s hard drive, into legitimate computer programs, or
it may attach itself to e-mail messages and spread across computer networks
by infecting other shared drives.
Finally let’s consider: with types of viruses
There are five categories of viruses: parasitic or file viruses,
bootstrap sector, multi-partite, macro, and script viruses.
Parasitic or file viruses infect executable files or programs in the
computer. These files are often identified by the extension . File viruses
leave the contents of the host program unchanged but attach to the host in