Python Tutorial - Functions

In Python, a "function" is a reusable block of code designed to perform a specific task. Functions allow you to encapsulate code, making it modular, easier to read, and efficient to maintain.

Functions can take **inputs** (called parameters or arguments) and can return **outputs** (results). They are defined using the `def` keyword, followed by a name, parentheses for optional parameters, and a colon. The code that executes when the function is called is indented under the definition.

Functions can be **built-in** (e.g., `len()`, `print()`) or **user-defined**, enabling developers to create their own reusable logic.

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