An operating system manages key computer components and functions, allowing other programs and applications to run. It controls the central processing unit, manages memory and storage, facilitates input/output to devices, and provides user interfaces. Common operating systems are found on personal computers, phones, servers, and more. They allocate processing time and memory resources to different programs, utilize virtual memory, include file management systems to organize storage, include drivers to communicate with hardware, and provide both command line and graphical user interfaces.

1. Purpose of a operating system.
Where might you find an operating system?
These operating systems are found on a personal computer, sat nav, network
servers, mobile phones, games consoles and also cars.
What are the main functions of an Operating System?
• Processor Management
• Memory Management
• Device Management
• Storage Management
• User Interface
What role does the OS play in managing the processor?
The OS controls what goes to the CPU, like music, documents and more.
What is virtual memory?
The OS manages virtual memory. In this way the computer can run more
applications than it has RAM for.

2. File Management
• Processor Management
• Memory Management
• Device Management
• Storage Management
• Application Interface
• User Interface

3. File Management
What is a File Allocation Table?
File Allocation Table is a computer file system architecture now widely
used on many computer systems. Supported by virtually all existing
operating systems. A table that stores information of where data is on
the hard disk.

4. Device Management (Input/Output)
How does a buffer work?
A buffer is a queue which makes files wait till they go
through to the processor which is buffering the rest of the
data. This is what makes videos or films loads up so they are
able to function properly so that you can see the other
contents of it.

5. Device Management
What is a device driver?
Drivers are translation programs which convert the messages from the
OS into messages that the hardware device can understand. A device
driver is a program that controls a type of device that is
attached/installed onto your computer. Such as printers, mouses,
CD_ROM readers and so on.

6. User Interface
What is a CLI and what is a GUI?
• CLI is a Command Line Interface in which you type
commands instead of choosing them from a menu or
clicking an icon. It is for interacting a computer system
or software to perform specific tasks.
• GUI is a graphical user interface such as mac os
x, Microsoft windows, which is a type of user interface
that allowed people to interact with electronic devices
with images rather than texts.

7. Processor Management
The OS manages the processes so that
you believe there are several things
happening at the same time.
The processors can only do one thing at a
time in order to give an appearance of lots
of things at the same time. The OS
switches between the different
processes.