In Python, modules allow us to use a set of functions without the need to redefine them. We can group related modules to create a package. Here is an example of a simple module:

def hi(name):
    print("Hello, " + name)

Save this module as "module1" in your directory.

To use the module, simply import it as follows:

import module1
module1.hi("Ali")
# Hello, Ali

Built-in module

Python comes with several built-in modules that we can import and use in our programs. For instance, we can use the "platform" module to get information about the operating system:

import platform
print(platform.system())
# Windows

We can also import modules from a package:

import matplotlib.pyplot as plt

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