Okay, so when people make things, they have to spend money on different things like materials, tools, and workers. These things that they have to spend money on are called "production costs". Now, one kind of cost that people have to pay when they make things is called "faux frais".
Faux frais are things that you have to pay for when you're making something, but they don't actually become a part of the final product. For example, if you're making a cake, you have to buy ingredients like flour and sugar, and you have to pay for things like electricity to run the oven and utensils to mix everything together. These are all part of the faux frais of making the cake.
These costs are important to keep in mind because they add up and can affect how much money you make in the end. If you're selling your cake, you'll want to make sure you're charging enough to cover not only the ingredients, but also the faux frais.
So, faux frais are like little expenses that you don't see in the end result, but they're still important to pay attention to when you're making something and selling it.