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i +  WHAT IS A USER INTERFACE?
                  A User Interface (UI) refers to a part of an operating system that allows a user to interact with
                  the computer. It provides a set of commands, menus, and icons that help in interacting with the
                  computer. An effective interface can make an operating system attractive and user-friendly.
                  Based on the working environment, user interfaces can be divided into two categories: Character
                  User Interface (CUI) and Graphical User Interface (GUI). Let us discuss these in detail.
                  Character User Interface (CUI)

                  In CUI operating system, the user sends commands and instructions to the computer in character
                  form i.e., by typing commands at the command prompt. The display on the screen does not
                  contain any graphic or picture, rather it contains only lines and characters. CUI is also called a
                  command line interface (CLI). A user can write commands on the command prompt to perform
                  a  particular  task.  DOS and  Windows  command  prompt  are  the  two  most commonly known
                  character user interfaces.




















                      Quick Byte

                      You can open the Windows Command Prompt by pressing the Windows + R shortcut key.
                      The Run dialog box appears. Type cmd and click on the OK button.

                  Advantages of CUI

                  There are certain advantages of CUI:
                  •  It is easy to understand.
                  •  It accepts input and displays output in the form of text.

                  •  It allows users to write commands by typing one or two-line text known as commands.
                  Disadvantages of CUI

                  It has a few disadvantages also, which are as follows:
                  •  People find it difficult to remember all the commands.

                  •  It is not user-friendly.
                  Graphical User Interface (GUI)

                  In GUI operating system, the interface is graphical i.e., the user interacts with figures and graphs
                  on the screen. It is basically menu or button based. A user can use options of the menu to
                  execute different functions.


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