This document provides an introduction to object-oriented programming concepts. It defines object-oriented programming as a way to conceptualize a program as interacting objects. Key concepts discussed include: - Classes define templates for objects and their properties and behaviors. - Objects are instantiated from classes and represent specific instances. - Inheritance allows new classes to inherit properties from parent classes. - Encapsulation groups related properties and methods together within objects. - Polymorphism allows methods to perform different actions depending on an object's properties.