folder

noun4

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 "Schoolwork".
3. •
   A folding knife, typically a folding 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
4. •
   A machine or person that folds things.