A Python function is like a reusable set of instructions in a computer program. It's a block of code that performs a specific task when you ask it to. Think of it as a mini-program inside your main program. Functions are handy because they help you write cleaner, more organized code. Instead of writing the same code multiple times, you can put it in a function and use it whenever needed. Functions make your code easier to understand and maintain, and they save you time and effort by allowing you to avoid repetitive work.

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