What is Interface:
As an interface we designate, in computing, the physical and functional connection that is established between two devices, devices or systems that function independently of each other. In this sense, communication between a human being and a computer takes place through an interface.
The word interface, as such, comes from English interface, which means 'contact surface'.
The interface is the mechanism or tool that enables this communication through the representation of a set of objects, icons and graphic elements that come to function as metaphors or symbols of the actions or tasks that the user can perform on the computer. For example, entering data on a blank sheet, sending a document to the trash, modifying a file, closing a program.
In computing, there are basically two types of interfaces: the physical interface, made up of objects that allow us to enter data and manipulate the computer, such as the mouse or keyboard, which would function as prostheses or extensions of our body; and the graphical interface, also known as GUI (Graphic User Interface), which allows the human being to interact with the computer through a series of graphic elements (windows, icons, etc.).
The user interface is the means that a person uses to communicate with a machine, device or computer. They are usually friendly and intuitive, so they are easy for a user to understand and use. It includes elements such as menus, windows, keyboard, mouse, alert sounds, that is, all those channels through which effective communication is established between the human being and the machine.
Graphical user interface
As a graphical user interface, also known as a GUI. Graphic User Interface), the computer program is known that uses a set of images and objects in a simulation graphical environment to represent all the actions available to the user in the interface. This system is called WYSIWYG (What You See Is What You Get, that is to say: 'what you see is what you get').