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Unformatted text preview: ry Large Scale Integration
Voice Over IP
Very Small Aperture Terminals
Videsh Sanchar Nigam Limited WTP
WTLS XML Wireless Transaction Protocol
Word Wide Web
Electronic Mail Protocol
Directory Server Protocol
external Data Representation
extensible HyperText Markup
extensible Markup Language Chapter 1
The word "computer" comes from the word "compute" which means to calculate. So a
computer is normally considered to be a calculating device that can perform arithmetic
operations at enormous speed.
In fact, the original objective for inventing the computer was to create a fast calculating
machine. But more than 80% of the work done by computers today is of nonmathematical or non-numerical nature. Hence, to define a computer merely as calculating
device is to ignore over 80% of its work.
More accurately, a computer may be defined as a device that operates upon data. Data
can be anything like bio-data of various applicants when the computer is used for
recruiting personnel, or the marks obtained by various students in various subjects when
the computer is used to prepare results, or the details (name, age, sex, etc.) of various passengers when the computer is employed for making airline or railway reservations, or
numbers of different types in case of application of computers for scientific research
Thus, data comes in various shapes and sizes depending upon the type of computer
application. A computer can store, process, and retrieve data as and when desired. The
fact that computers process data is so fundamental that many people have started calling
it a data processor.
The name data processor is more inclusive because modern computers not only compute
in the usual sense but also perform other functions with the data that flow to and from
them. For example, data processors may gather data from various incoming sources,
merge (process of mixing or putting together) them all, sort (process of arranging in some
sequence - ascending or descending) them in the desired order and finally print them in
the desired for...
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This document was uploaded on 04/07/2014.
- Spring '14