# Object Oriented Programming
Also known by its acronym OOP (**POO** in Spanish for *Programación Orientada a Objectos*) is a programming paradigm.

OOP is split between two "schools" of design: Simula-style OOP and [Smalltalk](smalltalk.md)-style OOP.

TODO

## Simula-style OOP
Most popular languages that have OOP have it in the Simula form. Some of these languages are:
- [C++](cpp.md)
- [Java](java.md)
- [JavaScript](javascript.md)
- [Python](python.md)
- ...

## Smalltalk-style OOP (message passing)
In Smalltalk-style OOP, objects communicate with each other by means of message passing. This
allows for greater dynamism, something that on Simula-style OOP can be archived with virtual methods.

Some languages based on or inspired by Smalltalk-style OOP are:
- Objective-C: some [C](c.md)-Smalltalk chimera; similar to C++ but using message passing instead of method calling.
- [Common Lisp's](common_lisp.md) CLOS
- ...