File or folder are other terms used for file folders, but
file folders is a common name for the item in the United
States. Manila folders are likely the most common, but file
folders come in many different forms. In the United States,
letter and legal sizes are common. The exact way to refer to
this kind of folder is somewhat unclear. There does not
appear to be an internationally standard term. The term file
folder seems to be one that dominates North American
language, but does not seem as common in other countries. As
stated, some refer to file folders simply as folders, but in
North America this is confusing because folder can refer to
several different things. Others use the term manila
folders, but this is confusing because not all file folders
are made of Manila hemp. This type of folder is sometimes
incorrectly called a "vanilla folder".
Another commonly used folder type is the hanging folder,
which has hooks on all four corners that slide over a rail.
Normally, hanging folders are used to file one or more
manila folders, and it is not a common practice to put loose
sheets directly into hanging folders. When some documents
need to be retrieved, the corresponding manila folder(s) are
removed from the hanging folder. The hanging folder itself
is left in its place on the rails.