Perfect Computer Notes

Role of e-commerce The role of e-commerce in daily life is becoming very important. This is the age of computer and internet. People find it easy to shop online and find the ordered goods on their door step. E-commerce can be used in the following ways: 1) Online Education Online education is becoming very popular. Different types of interactive tutorials are available on internet. The students can download online books and tutorials free or with some price. Some websites provide online lectures for students. 2) Electronic Banking Many banks are now introducing online banking. You can connect to your bank using your computer via internet. You can perform daily financial dealings from home. Many customers pay their bills using electronic banking. 3) Electronic Shopping Now, People can shop from home using internet. Different manufacturers present their products on internet. People visit their website and select suitable products to purchase. Credit card is normally

What do you mean by E-Commerce? Electronic Commerce (e-Commerce) is a general concept covering any form of business transaction or information exchange executed using information and communication technologies (ICTs). e-Commerce takes place between companies, between companies and their customers, or between companies and public administrations. Electronic Commerce includes electronic trading of goods, services and electronic material. BRIEF HISTORY OF E-COMMERCE + E-commerce started in early 1970’s with invention of electronic fund transfer(EFT). + Only used by large organizations, financial institutions and a few small business at that time. + After invention of EDI (Electronic Data Interchange) from financial institutions to manufacturers retailers, services and so on. + Many other e-commerce applications started from stock trading to travel reservation system. + With commercialization of internet in early 1990’s. The term electronic commerce was used. Interne

What is a User Interface? Explain its types. User Interface User Interface is the set of items on screen to interact with the computer . A user interacts and uses computer with the help of these items. For example, Windows Desktop is an example of user interface. Similarly Dos Prompt is also an example of user interface. Types of User Interface There are two main types of user interface: 1) Graphical user interface (GUI) 2) Command line user interface (CLI) 1) Graphical User Interface Graphical user interface or GUI provides different graphical items like windows, menus, tool bars and icons etc. A mouse or any other pointing device is used to work with these items. Commonly we select different commands from menu or toolbar with the help of mouse. We need not to type commands. We can double click on a file or folder to open it. We can double click on a shortcut to open a program. GUI is very easy to interact the computer. All versions of Windows, Macintosh, OS/2 and som

Topic: Explain Different Types Of Operating Systems with Examples Q. Explain different types of operating system What is an Operating system or OS The operating system is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs and applications. The Operating system or OS provides the base on which other programs and applications are installed and executed . Operating systems perform basic tasks in computer systems, like: Basic Functions of Operating System Providing the user interface Receiving the input from the keyboard, Sending  the output to the monitor screen,  Keeping track of files and folders on the disk, and controlling the functions of peripheral devices such as printers, etc. Different Types of Operating Systems With Examples in Detail Different types of operating system with examples Following are different types of operating system with examples: Explain differe

Topic: Different Functions Of Operating Systems What is an Operating System? Operating systems are an important type of system software. They provide a lot of facilities to the users. An operating system can be defined as software that acts as an interface between the end user and the hardware. Computer users can use computer systems that have an OS or operating system installed. For example, Microsoft Windows is a popular PC operating system. What is the Importance of Operating System in Computer? Each computer must have at least one operating system to run other programs. for example, if there is no operating system in your computer, you will not be able to use the computer. When you install an OS like Microsoft Windows on your computer, it displays its GUI that is Windows desktop on startup. Now you can use your computer with the help of graphical user interface elements like icons, menus, shortcuts on your computer screen. Similarly if you wish to install application prog

Topic: Explain Different Components of Operating System Q. What is an Operating System? Explain Components of an Operating system. Operating System An operating system is a set of programs that manages all computer components and operations. An operating system works as an interface between the user and the computer hardware. Examples of Operating Systems Some popular operating systems are DOS, windows, Unix, Linux, and OS/2. Without Operating System, a computer cannot do anything. Users interact with the computer through operating system. Operating system acts as an interface between a user and computer hardware. Components of an Operating system An Operating system has many components to manage all resources of a computer system as following: 1.    Process Management CPU can perform one task at one time. If there are many tasks, operating system decides which task should get the CPU first. 2.     Main Memory Management Operating system manages memory (RAM)for

Use Of TR Tag <TR> tag is used to create rows in HTML Tables. <TR> is the opening tag to start a row and </TR> is a closing tag to end a row. You can place pairs of <td>...</td> tags to create data cells in a row within the <tr>...</tr> tags. for example to create a row with only one cell containing data "Apples", we will use the following html code.and Mangoes respectively: <tr> <td>Apples</td> </tr> Apples If you want to create a row with two cells containing data "Apples" and "Mangoes" respectively, we will use the following html code. <tr> <td>Apples</td> <td>Mangoes</td> </tr> Apples Mangoes You canm also create a header row with the help of <TR> tag and <TH> tags. For example, to create a header row with two header cells with contents "Employee" and "Salary", we will use the following HTML co