A template or blueprint from which objects can be instantiated from.

An instance of a class.

A class which will not be used to instantiate objects.

The child class which inherits the methods and attributes from its parent class.

"Hiding" properties and methods of a class from the "outside world" by making these private.

Implementing a method multiple times to accept different parameters.

Implementing an inherited method differently in a sub-class.

When a sub-class inherits the methods and properties of a parent class.

Also called parent class or base class.

When a method or property can be accessed from outside the class.

When a method or property can only be accessed from inside the class.

A public method used to retrieve the content of a private property.

A public method used to set/overwrite the content of a private property.

A variable defined within a class to store a value.

A subroutine defined within a class to implement a behaviour.

Object-Oriented Programming

A method of a class that is automatically called when an object is instantiated from this class.

When a class has two or more parent classes.