folder

noun

1. An organizer that papers are kept in, usually with an index tab, to be stored as a single unit in a filing cabinet.“I keep all my schoolwork in a yellow folder.”
2. A virtual container in a computer's file system, in which files and other folders may be stored. The files and subfolders in a folder are usually related.“My essays are in the folder named "Essays".”
3. A machine or person that folds things.
4. A folding knife.