Muhammad Abdullah Assistant Programmer Bangladesh Computer Council

INTRODUCTION TO COMPUTER(4 hours)

Computer & its description invention of computer types of computeruses of computerMain parts of a personal computerhard ware & softwareinput device & output devicecomputer virus & antivirustypes of networksintranet, extranet, internet, www, e-maile-commerce, e-bankingabbreviations &terminology

? , (Mathematical) , , ,

: (High speed) (Accuracy) (Storage)- (Dilligency) (Automation) (Versality) (Logical decision)

: At home, office, bank, railway, Air-way, communication, education, research & development, entertainment, defense, industry, etc.

:AnalogDigitalMicro (PC, Laptop, Palmtop, etc.)Mini (IBM S/34, PDP 11, NCR S/9290, etc.)Mainframe (IBM 4300, UNIVAC 1100, Cyber 170)Super (14 countries have super computer, Cyber 205, SuperSXII )Hybrid, ,

:500BC-Abacus - Blaise Pascal Pascal Calculator Charles Babbage Different Engine, - Charles Babbage Analytical Engine- Hollerith Machine by Harman Hollerith- First electrical computer by Howard Aiken & IBM(MARK-1)- ABC (Atanasoff Berry Computer)- 1st Digital computer ENIAC (Electronic Numerical Integrator and Calculator) by J. Presper Eckert & John Mauchly. 30 Ton/ 17468 vacuum tube/30-50 feet space/150KW.

Charles Babbage, an English mathematician is regarded as the father of modern computer who invented two engines, (i) Difference engine and (ii) Analytical Engine.

:1951- EDVAC (Electronic Discrete Variable Automatic Computer), EDSAC (Electronic Delay Storage Automatic Computer) and UNIVAC-1(Universal AC )1953- IBM-650- FORTRAN by John Backjar1958-IC by Jack Kilby1960- COBOL by Dr. Grass Hopper1965- BASIC by Dr. John Kamony1971- First Intel-4004 microchip1975- LAN -

:- MS Dos 1981- IBM PC - - Hewlet Packared (HP) Laser printer1987- 80836 - Microsoft Windows 3.11995- Windows 951997- Pentium II processor1998- Windows 982005- Apple iPod

: ( ) , ( ), ( )- IC ( ) VLSI, Control by Chip ( )- Super VLSI, WAN ( ) Network, Internet

Components of Computer

: (Hard) (Visible) : , , .

- IC. ROM BIOS

A Brief History of Computer Virus : , , ,

, , , , ( ) How viruses spread:

Types of Virus:

antivirus- : , - - -

Norton Antivirus 2011Microsoft Security EssentialsAvast! Free AntivirusAVG Free AntivirusKaspersky Antivirus2010McAfee Security CenterBitdefenderPC Tools AntivirusSpyware Doctor With Antivirus 2010

(: Computer network) , , There are many types of computer networks, including: local-area networks (LANs) : The computers are geographically close together (that is, in the same building). wide-area networks (WANs) : The computers are farther apart and are connected by telephone lines or radio waves. campus-area networks (CANs): The computers are within a limited geographic area, such as a campus or military base. metropolitan-area networks MANs): A data network designed for a town or city. home-area networks (HANs): A network contained within a user's home that connects a person's digital devices.

Intranet:- an Intranet is an internal or private network that can only be accessed within the confines of a company, university, or organization.Extranet:- An extranet is similar to an intranetbut itis made accessible to selected external partners such as business partners, suppliers, key customers, etc, for exchanging data and applications and sharing information.As with an intranet, an extranet can also provide remote access to corporate systems for staff who spend lots of time out of the office, for instance those in sales or customer support, or home workers.Internet:- The Internet is a global network connecting millions of computers. More than 100 countries are linked into exchanges of data, news and opinions. According to Internet World Stats, as of December 31, 2011 there was an estimated 2,267,233,742 Internet users worldwide. This represents 32.7% of the world's population.

WWW :- The World Wide web is just a small part of the internet as whole;E-mail:- Electronic mail ,Electronic email allows you to send a message to another person almost instantly, anywhere in the world; E-commerce:- the phrase e- commerce is a buzzword which relates to buying or selling via the internet.E-banking:- the phrase e-banking realest to managing your money online

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