Transcript
COMPUTER SOFTWARE
FORM 4
Definition of Software
Also called a computer program It consists of a series of instructions
that tells the hardware of a computer what to do or how to do it
For example : Some instruction direct the computer to
allow you to input data from a keyboard and store it in the memory
Other instructions cause data stored in memory to be used in calculations
Usage of Software
Interact with the program through its user interface
This user interface controls how you enter data, instructions and how information is displayed on the screen
Types of Software
2. Application Software All program that perform specific tasks for users
1.System SoftwareUsed to control and manage computer devices and operations
Software
Operating System
Utility Program
Examples of application software
Microsoft Word, Microsoft Excel, Outlook
Express and Internet Explorer
System Software
Operating System program that is loaded into the computer
and coordinates all the activities among computer hardware devices
controls the hardware in the computer , peripherals, manages memory and files
enables the user to communicate with the computer and other software
examples of operating system are Microsoft Windows, Macintosh OS X, Linux , Unix and also DOS
System Software
Utility Programs allows user to perform maintenance-type
tasks It has been integrated into most major
operating systems such as format, check and defragment disks
examples of utility programs are antivirus and file compression programs
Example of System Software
Example of Application Software
Functions of Operating System
Starting a computer
Providing a user interface
Managing data & programs
Managing memory
Configuring Devices
Functions of OS
Functions of OS
Functions of Operating System Starting a Computer
first function of an operating system When start a computer, it loads the
operating system into the computer's memory. This process is called booting
What is Booting
Booting means to load and initialize the operating system on a computer machine. It can happen in two ways which is warm boot or cold boot
starting a computer that is already off. It happenswhen we turn on a computer that has been completely powered off
COLD BOOTCOLD BOOT
restarting a computer that is already on. It normallyhappens after installing a new software or hardware or after anapplication crashes or stops working.
WARM BOOTWARM BOOT
Functions of Operating System Providing a user interface
the most important function of an operating system, is providing the user interface
controls how the user enters data and instruction and how information is displayed
The user interface typically enables users: to start an application program to manage disks and files such as formatting,
copying and renaming to shut down the computer safely by following
the correct procedures
Functions of Operating System Providing a user interface
The three (3) types of user interface are Command-Line, Menu-Driven and Graphical, User Interface (GUI)
Functions of Operating System
Managing data & program When we start an application, the CPU loads
the application from storage into memory Multitasking operating systems enable users to
work with two or more application programs at the same time
Functions of Operating System
Managing memory Operating system is also responsible
for managing memory such as : optimizing the use of Random Access
Memory (RAM) allocating data and instruction to an area of
memory while being processed monitoring the contents of memory releasing data and instructions from being
monitored in memory when the process is done
Functions of Operating System Configuring Devices
Handling input and output, as well as enabling communication with input and output devices
Most operating systems come with drivers for popular input and output devices
These drivers install new devices and check whenever there is conflict with these devices
Types of Application Software Word Processing Spreadsheet Presentation Graphics Editing
Word Processing
Example : Microsoft Word, Corel Word Perfect, EasyWord, Celframe Word, Kword, OpenOffice Write
Allows users to create and manipulate documents containing mostly text and sometimes graphics
Can be used to produce documents such as letters, memos, reports, fax cover, sheets, mailing labels, news letters and web pages
Spreadsheet
Example : Microsoft Excel, Corel Quattro Pro, EasySpreadsheet, Celframe Spreadsheet, Kspread, openOffice Calc
Allows users to organize and manipulate data in rows and columns. Contains cell on which you can insert formula, labels, perform automatic recalculation
Produce worksheets that require repetitive recalculation
Features : containing formula, making charts, what-if analysis function, making query
Presentation
Example : Microsoft PowerPoint, Corel Presentations, EasyPresentation, Celframe PowerPresentation, Kpresenter, OpenOffice Impress
Allows users to create visual aids for presentations to communicate ideas, messages and other information to an audience
Also can insert audio in our presentation; but editing the audio using audio editing software such as Sony Sound 7.0
Graphics Editing
Example : Adobe Photoshop, Adobe Illustrator, Corel Draw, Jasc Paint Shop Pro, Inkscape
Allows users to work with drawings, photos and pictures
Provide users the ability of creating, manipulating and printing graphics
Types of Application Software Software Suite
Collection of individual program sold as single package
Designed to enhance the performance our work. It typically includes Word Processing, Spreadsheet, Presentation, E-mail
Currently, Microsoft Office is a very popular example of software suite being used
Utility Programs
Also known as service programs, is a type of system software that allow user to perform maintenance-type task, usually related to managing a computer
Types of utility programs: Built in – windows explorer, disk cleanup, disk
defragmenter Stand-alone utility – winzip, norton utility,
kaspersky
Utility Programs
Utility Programs Examples
1. File Management Windows Explorer
2. Diagnostic Utility Norton Utilities
3. File Compression WinZip, WinRAR, PKZip
4. Antivirus Kaspersky, AVG, Avast
5. Defragmenter Disk Defragmenter, Norton Speed Disk
6. Disk Scanner
Proprietary & Open Source Software
Proprietary Software (Closed Source Software) Company develop the owns software Have to pay the software if want to use Example : Microsoft Office 2007, Adobe Photoshop
CS3, Windows 7 Open Source Software
Free to use provides the original source code used to create it
so that advanced users can modify it to make it work better for them
Example : Linux, Mozilla Firefox 3.0, OpenOffice.org
Differences between Proprietary & Open Source Software
Open Software Proprietary
Linux, Ubuntu, OpenOffice.org Windows Vista, Microsoft Word
Purchased with its source code
Purchased without its source code
Users can modify the software
Users cannot modify the software
Can get open software for free of charge
Must pay to get the proprietary software
Can install software freely into any computer
Must have a license from vendor before install into computer
No one is responsible to the software
Full support from vendor if anything happened to the software
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