What are the hardware requirements for Windows 11 Installation ?

To install or upgrade to Windows 11, devices must meet the following minimum hardware requirements:

• Processor: 1 gigahertz (GHz) or faster with two or more cores on a compatible 64-bit processor or system on a chip (SoC).
• RAM: 4 gigabytes (GB) or greater.
• Storage: 64 GB* or greater available storage is required to install Windows 11.
  • Additional storage space might be required to download updates and enable specific features.
• Graphics card: Compatible with DirectX 12 or later, with a WDDM 2.0 driver.
• System firmware: UEFI, Secure Boot capable.
• TPM: Trusted Platform Module (TPM) version 2.0.
• Display: High definition (720p) display, 9" or greater monitor, 8 bits per color channel.
• Internet connection: Internet connectivity is necessary to perform updates, and to download and use some features.
• Windows 11 Home edition requires an Internet connection and a Microsoft Account to complete device setup on first use.

(Source: Microsoft website)

Why does a computer need an operating system?

At the simplest level, an operating system does two things:
It manages the hardware and software resources of the system. In a desktop computer, these resources include such things as the processor, memory, disk space, etc. (On a cell phone, they include the keypad, the screen, the address book, the phone dialer, the battery and the network connection.)
It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware.

 The first task, managing the hardware and software resources, is very important, as various programs and input methods compete for the attention of the central processing unit (CPU) and demand memory, storage and input/output (I/O) bandwidth for their own purposes. In this capacity, the operating system plays the role of the good parent, making sure that each application gets the necessary resources while playing nicely with all the other applications, as well as husbanding the limited capacity of the system to the greatest good of all the users and applications.

The second task, providing a consistent application interface, is especially important if there is to be more than one of a particular type of computer using the operating system, or if the hardware making up the computer is ever open to change. A consistent application program interface (API) allows a software developer to write an application on one computer and have a high level of confidence that it will run on another computer of the same type, even if the amount of memory or the quantity of storage is different on the two machines.

Even if a particular computer is unique, an operating system can ensure that applications continue to run when hardware upgrades and updates occur. This is because the operating system and not the application is charged with managing the hardware and the distribution of its resources. One of the challenges facing developers is keeping their operating systems flexible enough to run hardware from the thousands of vendors manufacturing computer equipment. Today's systems can accommodate thousands of different printers, disk drives and special peripherals in any possible combination.
The operating system is the interface between the hardware and the user. If there were no O/S, the computer would be an expensive door stop.