Summary  
This chapter explains the distinction between independent functions and object-tied methods, showing how methods within a class can access and modify an instance’s attributes to keep related behavior organized.  

General domain of usage  
Bank account management (financial applications)

**Functions and methods** are two core building blocks of Python. Functions work as reusable, independent pieces of code, while methods attach behavior to classes and objects, laying the foundation for writing **organized, maintainable, and scalable software**.

What is the key difference between a function and a method?

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.

Functions and Methods Explained