COMPUTER VIRUS

What are computer viruses?

Viruses are small programs that hide themselves on your disks (both diskettes and your hard disk).

Unless you use virus detection software the first time that you know that you have a virus is when it activates.

Different viruses are activated in different ways.

WHY YOU NEED TO BACKUP YOUR COMPUTER

Backup is the process of copying important data to another location to prevent their loss. Sometimes programs and even entire operating systems are copied, to be able to immediately continue working even when a computer breaks.

USES OF COMPUTER

PC at Home

Common uses for the computer within the home

_ Computer games

_ Working from Home

_ Banking from Home

_ Connecting to the Web

HOW TO USE COMPUTER TO COMMUNICATE

Inside a computer network may communication programs are installed on intranet computer to connect to the internet or even to internal computers

Web Browser: A web browser is a client program to navigate the www and retrieve web pages. It runs directly on the user’s computer as a client and connects to external web-servers, identified with the www prefix in the internet name, to retrieve web pages.

COMPUTER NETWORKS

A computer network is a set of devices which communicate and share resources. These devices are mostly computers, and sometimes stand-alone hard disk, telephones, printers and terminals (processorless computers which must rely on other computers to work)

SOFTWARE COMPONENT

Software can be divided into three big categories: operating systems, programs and data.

An operating system is the software that runs your computer and makes it think. It takes care of controlling computer hardware and human-computer interaction. There are currently widely used operating systems:

STORAGE DEVICES

Hard disk drives are an internal, higher capacity drive which also stores the operating system which runs when you power on the computer.

Measures: computers have a very element way to store data: they can remember only 0 or 1. A value of 0 or 1 is called bit and all computer data are stored as sequences of bits. a sequence of 8 bits is called a byte which is a quantity large

HARDWARE COMPONENT

We have two types of hardware this are: Input Devices and Output Devices

Input Devices:

A keyboard and mouse are the standard way to interact with the computer. Other devices include joysticks and game pads used primarily for games.

HARDWARE VS SOFTWARE

Hardware includes the parts of the computer system that you actually can touch (like the keyboard, mouse, monitor, or CPU). What’s a CPU? It’s explained below.

WHAT IS A COMPUTER?

An electronic device that stores, retrieves, and processes data, and can be programmed with instructions. A computer is composed of hardware and software, and can exist in a variety of sizes and configurations.