- (countable) A folder holds papers, usually with an writing on the top to show what is inside it.
- I keep all my schoolwork in a yellow folder.
- (countable) (Computing): A container on a computer which files and other folders may be saved. The files and subfolders in a folder are often about the same thing.
- (countable) I save my writing in the folder called "My Documents"
- Someone or something that folds things.