Perfect Computer Notes

Explain different types of computer networks:(LAN,WAN,MAN) Today, we will discuss the main types of computer networks on the basis of the maximum distance covered where they can be accessed and operate. The main types of computer networks are: LAN, WAN, MAN Explain different types of computer networks 1.    LAN - Local-Area Network 2.    WAN - Wide-Area Network 3.    MAN - Metropolitan-Area Network 1)LAN (Local Area Network) What is LAN or Local Area Network LAN stands for Local Area Network . It covers a small area. Most LANs are used to connect computers in a single building or group of near buildings. A network contained within a relatively small area, such as a classroom, school, or single building, is commonly referred to as a local area network. Hundreds or thousands of computers may be connected through LAN . LANs are used in office buildings, college or university campus etc. Local Area Networks can transfer data at a very high speed. Data tra

Define Network with examples. Give importance of Computer Network. COMPUTER NETWORK We can define a Computer Network as a set of two or more connected computers to share information and other resources (data, files, printers, hard disk, modem, CD-Rom Drive, CD-Writer, DVD-Rom Drive, DVD-Writer etc.). The computers in a network can share: Data, Information, Files Software Hardware (printers, disk, modems)etc. Advantages of Computer Networks EXAMPLES OF COMPUTER NETWORK Computer network can be used in an office. Different people in the office can share common information and printer. Net Cafes use Computer Network for internet sharing. Net Cafe Owners can save money by sharing one DSL Routers / Modem and a single Internet Connection. Computer Network is used in Computer Laboratories of Schools, Colleges and other educational institutes. Internet, is also an example of a computer network. Internet is a network of millions of computers connected through phone lin

Scanner / Optical Scanner A scanner is an input device for computer. It can scan any printed document with text as well as images. It will : Read any printed paper or picture, Convert text or images into digital form Saves this converted digital file into computer storage for later use Uses Of Optical Scanners You can scan your documents or pictures to: Store into computer memory. To save lot of effort and time because if you type the whole text on printed page, it will take effort as well as time). Show image or text on computer screen or on a multimedia projector's screen. In addition, you can send this scanned document or image to your friends all over the world with the help of Internet & Email. You can publish the scanned documents or images on your website or blog. You can apply online and send the scanned images of your academic documents in any part of the world within minutes. If your scanner supports OCR - Optical Character Recognition, you can scan a page

Today, computers are being used in every field of life. Here we discuss Uses of Computers in Science: Six Uses of Computers in Science Data Collection Uses of Computers in Science Scientists use computers to collect data and make hypotheses on the basis of collected data. Analysis and Testing Of Data Scientists use computers to analyze collected data and test their hypotheses. Exchanging Information Scientists use computers to exchange information with their colleagues. Different Researches all over the world can share their research with one another. This will be helpful for research because this will increase the rate of completion of research projects. Simulation of Different Events Scientists may use computers for simulation of complex events. For example, they can use computer simulation to predict about the affects of earthquake on buildings in a particular area. They may use computer simulation to know the effects of rapid population increase on we

Topic: Explain Main Difference Between System Software and Application Software            Differentiate between system software and application software Before , explaining the main differences between application software and system software, let us know the definitions of Application software and System software with examples. What is System Software: System software is a set of programs to control all components of computer and to manage overall operations of computer system. Differences between System software and application software System software is used as a base to install and run all application software. Examples of system software include: Operating Systems, like Microsoft Windows, DOS, Unix and Linux Device Drivers like Device driver software of a Printer (found on CD normally provided with the printer) Utility Programs like AVAST anti virus, Disk Scanners and File Viewers etc. What is Application Software? Users can use Appli

  Q. Explain Customized software and Packaged software. a) Customized Software Customized software is a type of application software that is designed for a particular customer or organization. When packaged software does not fulfill needs of an organization then a programmer / software developer / software engineer is hired. The programmer will develop needed custom software for that organization according to the organizations specific needs and requirements. Student Information software developed for Govt. Post Graduate College of Commerce, Rahim Yar Khan is an example of customized software .  It will be used to store all related data about students, admissions and examinations etc. b) Packaged Software Packaged software is a type of application software that is developed for sale to the general public. It is also known as off-the-shelf software or Pre-Written software. It facilitates the people to perform day-to-day activities. Examples of packaged software are w

Q. Write notes on the following: WWW, ISP, WEB PAGE, WEB SITE, WEB SERVER, WEB BROWSER WWW WWW stands for World Wide Web. It is also called web. It is the collection of all connected web documents stored on different web servers. These documents contain information in the form of text, pictures, audio and video clips. WWW has many advantages: · finding a job · searching information · advertisement for business · weather forecast · entertainment · education Difference between Internet and World wide web: The main difference between internet and World Wide web is that World Wide Web is only a service provided by internet. It provides access to web documents. While internet provides many other services also like FTP, TELNET and chatting etc. ISP (Internet Service Provider) OR IAP (Internet Access Provider ISP stands for internet service provider. It is a company that provides internet connections to users. For example WOL net, PAK net, CYBER net etc. are ISPs. To connect to i

Q.1 Define Data and Information. Differentiate between Data and Information. DATA Data is the collection of raw facts and figures. It is without any proper meaning. Data may be collection of words, numbers, graphics or sounds. Examples of Data 1) When students get admission in a college. They fill admission form. This form contains raw facts (data of student) like name, father’s name, address of student etc. 2) During census, data of all citizens is collected. INFORMATION Processed data is called information. When raw facts and figures are arranged in some order then they become information. Information has proper meanings. Information is useful in decision-making. Actually we process data to convert it into information. Exapmle of Information: 1) Stored data of students can be used to print address labels of students. 2) Census data is used to get report/information about total population of a country and literacy rate etc. Q.2 Describe types of Data. Ther

Q1. Define Network with example. Give importance of computer network.   COMPUTER NETWORK A computer network is a set of two or more computers connected together to share information and other resources. The computers in a network can share: Data, information  and Files Resources (printers, Cd-Rom Drives, DVD- Rom Drives, CD- Writers, hard disk, modems) Programs / software EXAMPLES OF COMPUTER NETWORK Computer network can be used in an organization's office. Different employees and managers in the office and organization can share common information. Internet, is also an example of a computer network. Internet is a network of millions of computers connected through phone lines. People can share information, files and talk with one another through internet. Internet cafe also uses computer network for internet sharing on all computers. A Computer laboratory in a school or college may use local area network for sharing data and other reources like printers, Cd-

Q.1 What is internet?             Internet is the network of networks around the world. It is made up of thousands of smaller networksInternet provides following main facilities:  ·  E- mail                    ·   Chat           ·Searching  jobs    ·       Advertising for business            ·E-commerce     ·Searching information Q.2 Define :WWW, ISP, WEB PAGE, WEB SITE, WEB SERVER, WEB BROWSER WWW stands for World Wide Web. It is also called web. It is the collection of all connected web documents stored on different web servers. WWW has many advantages: · finding a job    ·      searching information ·          e-commerce · education · advertisement for business   ·         weather forecast  ·     entertainment ISP stands for internet service provider. It is a company that provides internet connections to users. For example WOL net, PAK net, CYBER net etc. are ISPs. WEB PAGE:      A document created by HTML and found on web is a web page. A web page contains information in the