folder

Etymology

From fold + -er.

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. (computing) 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, typically a pocketknife.
   A funny name for a knife, the Needs Work folder is purpose-built as a working folder, and includes a straight, plain-edge, modified-wharncliffe blade, and a comfortable, ergonomic handle. 2010-08-20, Joe Kertzman, Knives 2011: The World's Greatest Knife Book, F+W Media, Inc.