Word processing is use of computer to produce documents consisting primarily of text or words, as distinguished from numbers. Word processor is a general application software used for producing such text documents.
In the initial days of development of computers and its application, the computer was mainly primarily used for performing mathematical calculations. The documents produced on computers consisted of recording the results of the calculation with very little textual material. With development of computers, special computers and computer software were developed to produce documents such as letters and reports. Such computers were used in the printing industry for composing the material for printing.
Now the computers is used extensively for word processing, and has almost replaced conventional typewriters across the world.