Question

define the four layer structure of an operating system
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Answer 1

Answer:

Layered Structure Approach

The operating system architecture based on layered approach consists of number of layers (levels), each built on top of lower layers. The bottom layer is the hardware; the highest layer is the user interface. The first system constructed in this way was the THE system built by E.W.

Explanation:

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Answer 2

Answer:

The correct answer to the question-"define the four layer structure of an operating system" is-

​Kernel, API, User interface & file system, and Hardware devices and device drivers.

1.KERNEL-

Explanation:

The four layer structure of an operating  system are as under-

The main components of an OS mainly include

1. Kernel,
2. API - Application program interface,
3. User interface & file system,
4. Hardware devices and device drivers.

1.KERNEL-

It is the essential center of a computer operating system (OS). It provides basic services for all other parts of the OS as  between the OS and hardware, it is the main layer and it helps with  the process and , file systems, device control, memory management and networking.

2.APPLICATION PROGRAM INTERFACE

It is a software which allows two applications to talk to each other. Every  time we are using an application  we are using an API.

3. USER INTERFACE

It  is the place of human-computer interaction and communication in a device. It is the way through which  user interacts with  a website.

4.HARDWARE DEVICES AND DEVICE DRIVERS-

They are  special kind of software program which controls a particular hardware device attached to a computer.They are essential for computer to work smoothly.

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