A "note case" is a small case or wallet that is used to carry important notes or papers. It is also called a "notebook," "folder," "portable file," or "note holder." Other synonyms for "note case" include "billfold," "cardholder," "document holder," "portfolio," and "pouch." These words can be used interchangeably depending on the context and purpose of the note case. For example, a businessman may prefer to use a portfolio to carry his documents or tablet while a student may use a simple notebook or folder to organize his notes. Whatever the term used, the essential function of a note case is to keep important notes and documents organized and easily accessible.