So, DIN 91379 is a code that is used to describe a specific type of screw.
A screw is a little metal thing with a pointy end and a twisty body. You use screws to fasten things together, like when you put together a toy or build a bookshelf.
Now, DIN 91379 means that the screw follows certain rules and standards on how it is made and what size it is. This is important because it means that screws with the same DIN code will be the same size and work the same way.
Think of it like baking cookies. If you use a recipe and follow the instructions exactly, you'll end up with cookies that look and taste the same every time. DIN codes are like recipes for screws - they make sure that every screw is the same size and works the same way every time.
So, if you need a screw with the DIN 91379 code, you know that you can use it with other things that also require that code and they will all fit together perfectly.