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Operating system:

An operating system is system software that provides an interface for user to interact with the computer. It controls the execution of all types of programs. A computer cannot do anything without operating system. Operating system must be installed on every computer. An operating system is responsible to allocate system resources. These resources include memory, processor, disk space, peripheral devices such as monitors, printers and modems etc.

LAN:

LAN stands for Local Area Network. It is the most common type of network. It covers a small area. It usually connects the computer and other devices within one office or a building or group of buildings. LAN is often used to share resources such as printers, hard disks and programs. LAN can transmit data in a limited distance. There is also a limit on the numbers of computers that can be attached to LAN.

CRUD:

CRUD stands for create, read, update and delete. CRUD operations directly manipulate data within a database while REST APIs manipulate data through HTTP requests and responses.

Pointing Devices:

An input devices used to control a pointer on screen is called pointing device. A pointer is small symbol that appears on the screen in graphical interface. A pointing device can be used to select text, graphics and other objects such as buttons, icons and menus commands.

Internet:

Internet is a large collection of computers all over the world that are all connected one another. It is a global network of computers. These computers are connected through different telecommunication links like:

• Phone lines
• Fiber optic lines
• Satellites and wireless connections

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