Postal Order
Overview
 
In the United Kingdom
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 (UK), a Postal Order is used for sending money
Money
Money is any object or record that is generally accepted as payment for goods and services and repayment of debts in a given country or socio-economic context. The main functions of money are distinguished as: a medium of exchange; a unit of account; a store of value; and, occasionally in the past,...

 through the mail
Mail
Mail, or post, is a system for transporting letters and other tangible objects: written documents, typically enclosed in envelopes, and also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post.In principle, a postal service...

. In the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, this is known as a Postal money order
Money order
A money order is a payment order for a pre-specified amount of money. Because it is required that the funds be prepaid for the amount shown on it, it is a more trusted method of payment than a cheque.-History of money orders:...

. Postal Orders are not legal tender
Legal tender
Legal tender is a medium of payment allowed by law or recognized by a legal system to be valid for meeting a financial obligation. Paper currency is a common form of legal tender in many countries....

, but a type of promissory note
Promissory note
A promissory note is a negotiable instrument, wherein one party makes an unconditional promise in writing to pay a determinate sum of money to the other , either at a fixed or determinable future time or on demand of the payee, under specific terms.Referred to as a note payable in accounting, or...

, similar to a cheque
Cheque
A cheque is a document/instrument See the negotiable cow—itself a fictional story—for discussions of cheques written on unusual surfaces. that orders a payment of money from a bank account...

.

The Postal Order is a direct descendent of the money order
Money order
A money order is a payment order for a pre-specified amount of money. Because it is required that the funds be prepaid for the amount shown on it, it is a more trusted method of payment than a cheque.-History of money orders:...

 which had been established by a private company in 1792. During World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 and World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, British Postal Orders were temporarily declared legal tender to save paper and labour.
 
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