Definition of "folder" in English

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 "Schoolwork".

3. A machine or person that folds things.

4. A folding knife, typically a pocketknife.