knowing that an application is form of communication computer communication occurs through the use of applications you use one application to answer your -mailanother to purchase goodsand still another to create presentation an application (sometimes called an appprovides the means to express human ideas to the computer in manner the computer can understand and defines the tools needed to shape the data used for the communication in specific ways data used to express the content of presentation is different from data used to purchase present for your mother the way you viewuseand understand the data is different for each taskso you must use different applications to interact with the data in manner that both the computer and you can understand it' possible to obtain applications to meet just about any general need you can conceive of today in factyou probably have access to applications for which you haven' even thought about purpose yet programmers have been busy creating millions of applications of all types for many years nowso it may be hard to understand what you can accomplish by creating some new method for talking with your computer through an application the answer comes down to thinking about the data and how you want to interact with it some data simply isn' common enough to have attracted the attention of programmeror you may need the data in format that no application currently supportsso you don' have any way to tell the computer about it unless you create custom application to do it the following sections describe applications from the perspective of working with unique data in manner that is special in some way for exampleyou might have access to video library database but no method to access it in way that makes sense to you the data is unique and your access needs are specialso you may want to create an application that addresses both the data and your needs thinking about procedures you use daily procedure is simply set of steps you follow to perform task for examplewhen making toastyou might use procedure like this get the bread and butter from the refrigerator open the bread bag and take out two pieces of toast remove the cover from the toaster