A homework question?

If so, then see http://www.google.com.

Shauna Kelly.  Microsoft MVP.
http://www.shaunakelly.com/word

Before PCs became common there used to be "computers" that just ran a
program to allow you to edit text and nothing else. They were called Word
Processors.
The term lived on so using WordPerfect, Word etc on a PC was called word
processing.