What is the difference between Title and Subject?

Thank you for your response.
That said, I was asking the question in the context of 'best practices', as I obviously know that these fields are not mandatory.
It's a bit like styles, we don’t have to use them, but when we understand their usefulness...

Hello

It's not like styles: they are the heart of Word, and using Word without styles is like driving a car without an engine: you have to push it!

These fields are only for personal organization. Word users are all different and the documents produced are very varied, so everyone organizes themselves as they see fit...
Let's not forget that the subject, like the title and other information, can be found particularly in the properties of a file through Windows. Similarly, we can display an Object column in Windows Explorer that will allow for faster searches. You can also search directly on the object.
So it really all depends on the organization of the company.

Imagine, for example, a company that works with foreign countries. It may require specifying the concerned country in the subject. This way, it will be easy to group all the documents related to a particular country later on... This is just one example; many others can be found.

m@rina

Hello m@rina,

Indeed, we can do whatever we want with the fields proposed in the properties of a Word document. It's true that "the sky is the limit" when it comes to inventing a use for these fields :)

Actually, I most likely poorly formulated my question: I was looking for a "general best practice" regarding the use of these fields, as I assumed there was originally a real reason why developers made these fields available to us. Like a practical reason that journalists or literature professionals would probably find obvious, but which doesn't jump out at me.

As I mentioned last week, there's this article (https://ask.metafilter.com/79636/Titles-and-Subs in English) that I found quite relevant. The example given at the end of this article is:
Title: The Economic Crisis in Argentina
Subtitle: A Contagion Situation?
Subject: Economic Crises -- Latin America
Keywords: Argentina, Monetary Crisis, Minsky

So the Subject seems to have a more general purpose than the Title.
In Office 2007, I can't find the "Subtitle" field, which I find very useful. So I think I'm going to repurpose the Subject field to store a subtitle...

Thank you for your response Ghörgh. On the page you mentioned, it looks more like an article in a CMS, with a title and a 'hook'. I feel that the Subject should not be a series of sentences, but something much more concise. However, I don't see the difference with a Title (for now).

Yes, the example I give may not be the best, but it seems to me that it corresponds quite well to the idea nonetheless.

Basically, a simpler example
Title: CCM
Subject: Computer forum

I see the title as the name of the document, and the subject as what it is about.

But I might be mistaken.

Personally, I was thinking precisely not to make a direct link between the title and the file name.

I wonder if the fields Title, Subject, Category... go from the most detailed to the most general.
For example:
Title: Easily delete an Instagram account
Subject: Using Instagram
Category: Instagram, Account

So, the file name would be something like:
"Using Instagram - Easily delete an Instagram account.docx"

Yes, that's basically what I think too.
To go back to my example:
Title: CCM
Subject: IT Forum
Category: Forum, IT, web... etc

And the file name would be: CCM - IT Forum.docx

The example CCM may not be the best, but it's for the idea ^^

After that, I think you can do a little what you want with it, and it should be adapted to your needs.