Information is from the Internet to find, specifically who wrote the first, not clear.
Model is usually referred to as models. This model may be what you need to analyze, perhaps your algorithm. But the most likely is the MVC site, or the model in M in the GUI development pattern.
So when to use model depends on what you are going to do. You were going to take a long time to do it. If you do a short project you can use the model. If the project is more than 1 days, you can still use the model. Then you should design your model according to the frame you are using.
Module refers to modules, the concept is originally from the structure of programming. In short, it is a standalone Python program file. Can be used by other program import methods. This thing will be used in most cases. This is a good programming habit as long as the program is more than 50 lines or so it usually builds a module independently.
There are also 1000 lines of programmers who are a file. The program that is written is not necessarily bad. This is the main control of their own ability. I am accustomed to limiting my thinking to a small area, so I will make a unit, module, and test independently for each good one problem. Re-use later.
Yes, there is a mod thing, often seen in the game, is the abbreviation of modification.
The difference between model models and module modules