Alternatively known as file management or FS, a file system is a method of organizing and retrieving files from a storage medium (e.g., hard drive). File systems usually consist of files separated into groups called directories. Directories can contain files or additional directories. Today, the most commonly used file system with Windows is NTFS.
Without file management, all files would have no organization, and it would be impossible for a file with the same name to exist. Files are often managed in a hierarchy, which lets you view files in the current directory and then navigate into any subdirectories.
Examples of file systems
Over the evolution of computers, there have been many different file systems used. Below are links to the most common file systems.