What is a function in Python?

A function in Python is a reusable block of code that performs a specific task. Functions are used to encapsulate code that can be executed whenever needed, making the code more modular, organized, and easier to maintain.

def greet():
    print("Hello, world!")  # This function prints a greeting

Functions can take inputs, known as arguments, and return outputs. They are fundamental to structuring programs and avoiding code repetition.

Using functions allows you to break down complex problems into smaller, manageable parts, improving the readability and maintainability of your code.