An action that causes something to happen.

A program designed to run blocks of code or functions in response to specified events (e.g. a mouse click)

An overarching term for the coding tasks involved in making a program respond to events by triggering functions.

a command that can be set up to trigger a function when a particular type of event occurs on a particular UI element.

On-screen objects, like buttons, images, text boxes, pull down menus, screens and so on.

The visual elements of a program through which a user controls or communicates with the application. Often abbreviated UI.

Finding and fixing problems in an algorithm or program.

All values in a programming language have a "type" - such as a Number, Boolean, or String - that dictates how the computer will interpret it. For example 7+5 is interpreted differently from "7"+"5"

Any valid unit of code that resolves to a value.

A placeholder for a piece of information that can change.

The equality operator is used to compare two values, and returns a Boolean (true/false).

A variable whose scope is "global" to the program, it can be used and updated by any part of the code. Its global scope is typically derived from the variable being declared (created) outside of any function, object, or method.

The common programming structure that implements "conditional statements".

Dictates what portions of the code can "see" or use a variable, typically derived from where the variable was first created.