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About Us

Mahmood Alam - Founder of www.computergap.com

( www.computergap.com / www.forfreeeducation.blogspot.com )

I am Mahmood Alam, the founder of this blog : www.computergap.com / www.forfreeeducation.blogspot.com. I am an Instructor by profession and a part time blogger. I am not able to give much time to blogging because of my job. This blog is another place to share knowledge. Two of my students also help keep this blog updated. Thanks nice guys! Keep it up!

www.computergap.com / www.forfreeeducation.blogspot.com is a free source of perfect computer notes to decrease the computer gap and spread computer science knowledge and information technology skills. We work to spread computer literacy - free computer science education for all.

Contact Us

( www.computergap.com / www.forfreeeducation.blogspot.com )

You may contact us at softalogy@gmail.com for any queries, suggestions, complaints etc. Thanks for coming here on www.computergap.com / www.forfreeeducation.blogspot.com.

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Definition and History of ECommerce

What do you mean by E-Commerce? Electronic Commerce (e-Commerce) is a general concept covering any form of business transaction or information exchange executed using information and communication technologies (ICTs). e-Commerce takes place between companies, between companies and their customers, or between companies and public administrations. Electronic Commerce includes electronic trading of goods, services and electronic material. BRIEF HISTORY OF E-COMMERCE + E-commerce started in early 1970’s with invention of electronic fund transfer(EFT). + Only used by large organizations, financial institutions and a few small business at that time. + After invention of EDI (Electronic Data Interchange) from financial institutions to manufacturers retailers, services and so on. + Many other e-commerce applications started from stock trading to travel reservation system. + With commercialization of internet in early 1990’s. The term electronic commerce was used. Interne...

Explain different types of storage devices

Topic: Explain different types of storage devices in Computer systems Storage Devices Storage devices are used to store data and instructions permanently. Storage devices are also called secondary storage devices / backing storage devices / external storage devices or auxiliary storage devices. Examples of storage devices include Hard Disk, CD and DVD etc. Why Secondary Storage Devices are Used? Secondary storage devices are used because: Primary memory(RAM) is volatile and temporary. When computer is switched off, all data in ram is erased. Storage devices can store large amounts of data and instructions permanently whereas Primary memory has less capacity of storing data. Types Of Storage Devices There are three main types of storage devices: Magnetic Tape Magnetic Disk Optical Disk Flash Memory storage devices 1. Magnetic Tape Magnetic tape is the oldest storage device. It is made of plastic coated with m...

Services Of Internet

SERVICES PROVIDED BY INTERNET Important services provided by internet are as the following: 1. THE WORLD WIDE WEB This is also called web or www or 3w. The collection of all web pages in all web sites on Internet is called www. These web pages provide us information in the form of text, pictures, audio and video formats etc. 2. E-MAIL E-mail stands for electronic mail. It is the most popular, cheap, easy and fastest mailing service. We can send and receive messages on internet with in seconds or minutes. 3. EMAIL DISCUSSION GROUPS These are used to discuss different topics with other people by email. 4. NEWSGROUPS Newsgroups are discussion groups on internet. They are used for free exchange of information. A user sends a message to the news group site. Other users read this message from this site and reply. Newsgroups are provided by special computers called news servers. 5. ECOMMERCE It stands for Electronic Commerce. E-commerce means to carry out business dealings by internet...

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