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WHAT IS COMPUTER SOFTWARE?
Most computer users purchase the software they need for their computer systems. The two major categories of computer software are (1) application software
and (2) system software.
Application Software
Application software allows you to perform an application-related function on a computer. A wide variety of programs is available, but for microcomputers,
the three most widely used types of application software are word processing, spreadsheet, and database management.
Word Processing Software
Word processing software enables you to use a computer to create documents. As you use a word processing program, words are keyed in, displayed on the
screen, and stored in main memory. If necessary, you can easily correct errors by adding or deleting words, sentences, paragraphs, or pages. You can also establish margins, define page lengths, and
perform many other functions involving the manipulation of the written word. After you have created and corrected your text, you can print it and store it on auxiliary storage for reuse or future
reference.
Spreadsheet Software
Spreadsheet software is used for reporting and decision making within organizations. At home, you can use a spreadsheet program for budgeting, income tax
planning, or tracking your favorite team's scores. You might choose spreadsheet software to enter the values and formulas you need to perform these calculations. One of the more powerful features of
spreadsheet application software is its capability to handle what-if questions such as, What would be the effect on profit sales increased 12% this year? The values on the worksheet could easily be recalculated to provide the answer.
Database Software
Database software is used to store, organize, update, and retrieve data. Once stored in the database, data can be organized and retrieved in the manner you
specify. For example, in a database containing employee information, you could request a report showing an alphabetical list of all employees in the accounting department.
System Software
System software consists of programs that start up the computer-load, execute, store, and retrieve files-and perform a series of utility functions. A part of
the system software available with most computers is the operating system. An operating system is a collection of programs that provides an interface between you or your application programs and the
computer hardware itself to control and manage the operation of the computer. System software, including operating systems, available on computers performs the following basic functions: (1)
booting or starting the computer operation, (2) interfacing with users, and (3) coordinating the system's access to its various devices.
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