Franking refers to any devices, markings, or combinations thereof ("franks") applied to mails of any class which qualifies them to be postally serviced. Types of franks include uncanceled and precanceled postage stamps (both adhesive and printed on postal stationery), impressions applied via postage meter (via so-called "postage evidencing systems"), official use "Penalty" franks, Business Reply Mail (BRM), and other permit Imprints (Indicia), manuscript and facsimile "franking privilege" signatures, "soldier's mail" markings, and any other forms authorized by the 191 postal administrations that are members of the Universal Postal Union. 
While all affixed postage stamps and other markings applied to mail to qualify it for postal service is franking, not all types and methods are used to frank all types or classes of mails. Each of the world's national and other postal administrations establishes and regulates the specific methods and standards of franking as they apply to domestic operations within their own postal systems.  Although there are differences in the manner that the postal systems of the 191 nations  that belong to the Universal Postal Union (UPU) apply and regulate the way their mails are franked, most mails fall under one (and sometimes more) of four major types and/or methods of franking: postage (stamps, etc.), privilege, official business, and business reply mail.
Any and all conflicts that might arise affecting the franking of mails serviced by multiple administrations which result from differences in these various postal regulations and/or practices are mediated by the UPU, a specialized agency of the United Nations which sets the rules and technical standards for international mail exchanges.   The UPU co-ordinates the application of the regulations of postal systems of its member nations, including as they relate to franking, to permit the servicing and exchange of international mails.  Prior to the establishment of the UPU in 1874, international mails sometimes bore mixed franking (the application of franking of more than one country) before the world's postal services universally agreed to deliver international mails bearing only the franking of the country of origin.
"Postage" franking is the physical application and presence of postage stamps, or any other markings recognized and accepted by the postal system or systems providing service, which indicate the payment of sufficient fees for the class of service which the item of mail is to be or had been afforded. Prior to the introduction to the world's first postage stamps in Britain in 1840 (" Penny Black") and 1841 (" Penny Red"), pre-paid franking was applied exclusively by a manuscript or handstamped "Paid" marking and the amount of the fee collected.  The first US postage stamp was the red brown Five cent Franklin (SC-1) issued in 1847.
In addition to stamps, postage franking can be in the form of printed or stamped impressions made in an authorized format and applied directly by a franking machine, postage meter, computer generated franking labels or other similar methods ("Postage Evidencing Systems"),  any form of preprinted "postage paid" notice authorized by a postal service permit ("Indicia"),  or any other marking method accepted by the postal service and specified by its regulations, as proof of the prepayment of the appropriate fees. Postal franking also includes "Postage Due" stamps or markings affixed by a postal service which designate any amount of insufficient or omitted postage fees to be collected on delivery. 
"Privilege" franking is a personally pen-signed or printed facsimile signature of a person  with a "franking privilege" such as certain government officials (especially legislators) and others designated by law or Postal Regulations. This allows the letter or other parcel to be sent without the application of a postage stamp. In the United States this is called the "Congressional frank" which can only be used for "Official Business" mail.  
In addition to this type of franking privilege, from time to time (especially during wartimes) governments and/or postal administrations also authorize active duty service members and other designated individuals to send mails for free by writing "Free" or "Soldier's Mail" (or equivalent) on the item of mail in lieu of paid postal franking, or by using appropriate free franked postal stationery. In the United States, unless otherwise designated, such mails are serviced by both the military and civil postal systems that accept them as First Class letter mail. 
"Official Business" franking is any frank printed on or affixed to mails which are designated as being for official business of national governments (i.e. governments which also have postal administrations) and thus qualify for postal servicing without any additional paid franking.  In Commonwealth countries the printed frank reads "Official Paid" and is used by government departments on postmarks, stationery, adhesive labels, official stamps, and handstruck or machine stamps.
In Canada, the monarch, the Governor General, members of the Senate of Canada, members of the House of Commons, the Clerk of the House of Commons, Parliamentary Librarian, Associate Parliamentary Librarian, officers of parliament, and the Senate Ethics Officer all have franking privilege and mails sent to or from these people are sent free of charge. Bulk mail from members of the House of Commons is limited to four mailings per year and to the member's own electoral district. Individuals may send letters to any of the above office-holders without charge. 
In the United States such mails are sent using postal stationery or address labels that include a "Penalty" frank ("Penalty For Private Use To Avoid Payment of Postage $300")  printed on the piece of mail, and/or is franked with Penalty Mail Stamps (PMS) of appropriate value.  Such mails are generally serviced as First Class Mail (or equivalent) unless otherwise designated (such as "bulk" mailings).
"Business Reply Mail" (BRM) franking is a preprinted frank with a Permit number which authorizes items so marked to be posted as First Class Mail with the authorizing postal service without advance payment by the person posting the item. (International Reply Mail may specify Air Mail as the class of service.) Postage fees for BRM are paid by the permit holder upon its delivery to the specified address authorized by the permit and preprinted on the item of business reply mail. Governments also use BRM to permit replies associated with official business purposes.  
A limited form of franking privilege originated in the British Parliament in 1660, with the passage of an act authorizing the formation of the General Post Office. By 1772, the abundance of franked letters represented lost revenue of more than one third the total collections of the Post Office.  In the 19th century, as use of the post office  increased significantly in Britain, it was expected that anybody with a Parliament connection would get his friends' mail franked.
In the United States, the franking privilege predates the establishment of the republic itself, as the Continental Congress bestowed it on its members in 1775. The First United States Congress enacted a franking law in 1789 during its very first session. Congress members would spend much time "inscribing their names on the upper right-hand corner of official letters and packages" until the 1860s for the purpose of sending out postage free mail. Yet, on January 31, 1873, the Senate abolished "the congressional franking privilege after rejecting a House-passed provision that would have provided special stamps for the free mailing of printed Senate and House documents." Within two years, however, Congress began to make exceptions to this ban, including free mailing of the Congressional Record, seeds, and agricultural reports. Finally, in 1891, noting that its members were the only government officials required to pay postage, Congress restored full franking privileges. Since then, the franking of congressional mail has been subject to ongoing review and regulation.
The phrase franking is derived from the Latin word "francus" meaning free. Another use of that term is speaking "frankly", i.e. "freely". Because Benjamin Franklin was an early United States Postmaster General, satirist Richard Armour referred to free congressional mailings as the "Franklin privilege."
The use of a franking privilege is not absolute but is generally limited to official business, constituent bulk mails, and other uses as prescribed by law, such as the "Congressional Frank" afforded to Members of Congress in the United States. This is not "free" franking, however, as the USPS is compensated for the servicing of these mails by annual tax-funded appropriations against which each Member is given a budgeted amount upon which he or she may draw.
A six-member bipartisan Commission on Congressional Mailing Standards, colloquially known as the "Franking Commission," is responsible for oversight and regulation of the franking privilege in the Congress.  Among the Commission's responsibilities is to establish the "Official Mail Allowance" for each Member based proportionally on the number of constituents they serve. Certain other persons are also accorded the privilege such as Members-elect and former presidents and their spouse or widow as well. A president who is convicted in the Senate as a result of an impeachment trial would not have a franking privilege after being forced to leave office.  The sitting president does not have personal franking privileges but the vice president, who is also President of the Senate, does.
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|Wikisource has the text of the 1911 Encyclopædia Britannica article Franking.|