In Python, a module is a file containing Python code that can be imported and used in other Python programs. Modules are used to organize and reuse code, and they make it easier to write large, complex programs.

        A module can contain variables, functions, and classes that can be used in other programs. To use a module in your program, you first need to import it using the import statement. For example, to use the math module in your program, you would write:

import math

        After importing the module, you can use its variables, functions, and classes in your program. For example, to use the sqrt function from the math module to calculate the square root of a number, you would write:

import math

x = 16
y = math.sqrt(x)
print(y)  # Output: 4.0

        In addition to built-in modules like math, Python also allows you to create your own modules. To create a module, you simply write the Python code that you want to include in the module, and save it as a file with a .py extension. You can then import the module into your program using the import statement.

        In summary, a module in Python is a file containing Python code that can be imported and used in other Python programs. Modules make it easier to organize and reuse code, and they allow you to create your own reusable libraries of Python code.