The GUI(graphical user interface) is combination of the UI and UX. 

UI (User Interface) : 

User Interface (UI) Design is the graphics creation of, illustrations,photoshop,Artwork layout for digital product within its various device views. UI is everything designed for person may interact with application. 

Interface elements:

-input controls: buttons,drop-down menus,data fields

-navigational components: search fields, slider, icons,tags

-informational components: progress bars, notifications, message boxes.

Types of UI: 

-GUI (Graphical User Interface)

-Command line interface

-Menu Driven Interfa ce

-Form Based Interface

-Natural Language Interface

UX (User experience) : 

UI conjunction with user experience (UX), which deveice response time and the content that is presented to the user within the context of the user interface.use the   language HTML and CSS,it easier to create a strong user interface and experience through the gears up.