Machine
A Folder is a machine that is used for folding. (1545-1555)
Office product
A folder is a sheet of heavy paper stock or other thin but stiff material, folded approximately in half, that is used to group together or protect one or more loose pages that are placed within.
Computing
In computing, a folder is the WIMP (GUI) metaphor used to represent one directory in a filing system. It is envisioned as containing objects (files, sub-folders, and the like) in the same way a physical folder groups together physical documents.
See also
