Add new product

This is probably a very simple question but it has been bugging me for ages. When adding a new product, you have the option of barcode and tag. What is the Tag box? Is it something that if I fill out, will show up on some sort of report. Example categorizing items to food, drink, desserts?

Product Tag is a general field useful to add additional info about product. Does nothing by itself but you can access that info from rules or printer templates.

Here is a use case. You can find more uses by searching forums.