👉 COMPUTER 👈

The word "computer" comes from "compute " , which means , "to calculate" . Hence , people usually consider a computer to be a calculating device that can perform arithmetic operation at high speed . Although the original objective of inventing a computer was to create a fast calculating devices , we now define a computer as a devices that operates upon data because more than 80% of work done by today's computers is data processing. Data can be anything like bio-data of applications when computers is used for short listing candidates for recruiting; marks obtained by students in various subject when used for preparing result ; details ( name , age ,sex , etc. )of passengers when used for making airline or railway reservations ; or number of different parameters when used for solving scientific research problems , etc. Notice from the example that data can be either numerical , non- numerical , or a mixture of both .

A computer is often referred to as a data processor because it can be store , process and retrieve data whenever desired . The name data processor is more inclusive because modern computers not only compute in usual sense but also perform other functions with data that flows 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 sequences - ascending or descending ) them in the desired order , and finally print them in desired format . Notice that none of these operations involves arithmetic computations in the usual sense but a computer is the most suitable devices for performing them.
the activity of processing data using a computer is called data processing . data processing consists of three sub-activity: capturing input data , manipulating the data , and managing outputs results . As used in data processing information is data arranged in an order and form that is useful to people receiving it . Hence , data is raw material used as input to data processing and information is processed data obtained as output of data processing