Definitions

GUI – Graphical User Interface

Unlike Console based programs, users interact with GUI programs using visual elements such as buttons, sliders, text boxes, drawing canvases, etc.

Java Swing

Refers to an old library of GUI components like buttons, sliders, text boxes, etc. Swing components always start with the letter J.
Examples: JButton, JSlider, JTextBox, JLabel, etc.

JavaFX

Refers to modern library of GUI components that can be used instead of Swing.

We will use JavaFX in this unit.