Everything on a computer is stored in files. I have 36,476 files of my own at the Statistics Department. Sometimes, the material to be stored is too complex to store in a single file and multiple files are used. Complex documents, for example, are often stored as parts in a collection of files. A book may consist of a title page in one document, a preface in another, a glossary in a third and each chapter in its own file.
Files have names.
Often the name indicates something about what is stored in the file. Files can be copied, stored on hard disks, diskettes, CD-ROMs, tapes and other media. Files can be erased. Folders are collections of files. Folders have names.