Perfect Computer Notes

INTERNET Internet is the network of networks around the world. It is made up of thousands of smaller networks. It is a global communication system. We can send and receive information from a city or country to another through Internet. Main components of Internet are computers, communication media and modem etc. Modem is used to send and receive information though telephone lines.     Internet provides following main facilities:                ·    E- mail                ·    Chat                ·    Searching jobs                ·    Advertising for business                ·    E-commerce                ·    Searching information To use Internet we must have  ·    suitable computer  ·    telephone line  ·    modem  ·    web browser (for example, internet explorer)  ·    Internet connection or scratch card of an ISP HISTORY OF INTERNET 1) ARPANET   The seeds of internet were planted in 1969 by Advanced Research Projects Agency (ARPA) of US department of

NEED OF ELECTRONIC DATA PROCESSING Today, no business can exist without information . There is no more business without information. To improve the business there is a need to improve data processing and information system. Now it’s the age of competition that involves information technology for faster and accurate data processing . These days computer is playing a main role in every field of life. It is also playing a central role in business . In business, a large amount of data has to be processed daily. It is impossible to process such a large amount of data without a computer. Explain importance / need of electronic data processing in business We know that a computer can process data accurately and quickly. The need of data processing in business is clear. Following are the reasons: 1) RECORD KEEPING An organization cannot exist without records. Record keeping is a difficult and complex problem. Electronic data processing has simplified it. Receiving, storing, pro

Today we will discuss different types or levels of data processing in detail. Let us define Data processing first. DATA PROCESSING Data processing is the sequence of operations performed on data to convert it into useful information . These operations may be arithmetic, statistical or logical operations. We can arrange or classify data. We can send and receive data from one point to another. Explain different types of data processing TYPES OF DATA PROCESSING (OR) LEVELS OF DATA PROCESSING) There are three types of data processing . 1) Manual data processing 2) Mechanical data processing 3) Electronic data processing We may also use the term Levels of data processing. First level of data processing was manual data processing when there were no calculating devices (before the invention of calculators). Therefore all processing jobs were performed manually by hand with the help of pen , paper and mind. In second level of data processing, machines like calculat