Have you ever heard of the word "metadata"? It's like a little bit of information that describes something else. For example, if you take a photo of your cat, the metadata might say when you took the photo, where you took it, what kind of camera you used, and what settings you had on your camera when you took the photo.
Now, imagine that there are a group of people who want to figure out how to make all of the different kinds of metadata work together better. They want to make it easier for people to find and use information that has been added to a file or a document. This group of people is called the metadata working group.
They might talk about things like how different kinds of programs can read and understand metadata, how to make sure that metadata is accurate, and how to make sure that metadata is secure so that only the right people can see it.
By working together, the metadata working group is helping to make it easier for everyone to use and share information in a way that makes sense.