Summary  
This chapter covers the distinction between instance variables—defined inside methods (typically `__init__`) with `self.` and unique to each object—and class variables—defined in the class body without a prefix and shared across all instances.  

General domain of usage  
Object-oriented programming in Python.

When working with Python classes, understanding the two main types of variables is essential. **Instance variables** belong to individual objects created from a class, holding data unique to each instance. **Class variables** are shared across all instances of the class, storing data that is common to every object.

What is the main difference between instance variables and class variables?

Learn how to build clean, secure, and scalable applications with Object-Oriented Programming in Python. Cover the fundamentals of classes and objects, then moves into advanced concepts such as inheritance, composition, polymorphism, and encapsulation. With clear explanations and practical examples, you'll develop the ability to design Python programs that are powerful, maintainable, and ready for real-world use.

Learn the core building blocks of object-oriented programming in Python. This section covers classes, objects, methods, and variables, giving you a solid base to understand how OOP organizes and structures code.

Instance and Class Variables