When you save a file on your computer, it needs to go somewhere so that you can find it later. Think of a file system like a big, organized closet for your computer to store all your files.
Now, there's a special kind of file system called Romeo. Just like how your closet has shelves and hangers for different kinds of clothes, Romeo has different areas for different types of data.
For example, there's a special area for files that your computer needs to use to run properly (like the operating system), another area for files related to programs you've installed, and another area for files you create yourself (like documents and pictures).
Romeo also makes sure that different parts of your computer can easily find and access the files they need. It's kind of like a map that helps your computer figure out where everything is.
So basically, Romeo is a special way of organizing and storing all your computer's files so that they're easy to find and use.