A postal order is not a legal tender, but a type of promissory note, similar to a cheque. A Postal Order is used for sending money through the mail.
A money order is an order for a specific sum of money, usually purchased with cash at a bank or Post Office, that can be used to make payments.
We use these to send money to either an individual who does not have any bank account, or in payment of Home Choice monthly installments, etc.
