Visual Basic called an event-driven programming language

Visual Basic is a language for building graphical user interface (GUI) applications. Unlike command line based programs which run sequentially until the program is returned, actions in GUI applications start at the time when the user triggers an event of the control component in the program interface. Examples of events include: click, double click, mouse over, mouse down, mouse up, key press, key down, key up, drag, focus, blur, change, select, timer, etc. In normal cases, a program is terminated when the user clicks the exit button in the program interface.