Calling a module means using the functions and variables defined within that module. It's like opening a toolbox and taking out the tools you need.
Defining a module means creating the toolbox itself, with its own set of functions and variables.
Here's an analogy:
* Calling a module is like using a pre-made cake mix: you're using the ingredients and instructions already provided.
* Defining a module is like writing your own cake recipe from scratch: you're creating the instructions and ingredients that others can use later.
In short, calling a module utilizes existing code, while defining a module creates new code.