A postal code is an identifier for a specific geographic area that helps mail carriers and other delivery services sort and route mail more accurately. It is an essential piece of a country's postal system and can vary in format and structure from country to country, but the overall purpose remains the same: to make it easier for people to communicate with each other. Postal codes are often tied to specific geographical areas or administrative boundaries. They can be loosely based on counties, like in the United States, or tightly tied to one specific address or organization. For example, a UK postcode might include a house number or name in addition to the postal code (e.g., GL20 8NX/1 or 1 Frampton Farm Cottages). These codes are also used ine-commerce and to verify the identity of someone making a purchase. In fact, most credit card companies require the customer to provide their postal code before shipping any items or allowing them to complete an online order. While modern postal codes are a fairly recent development, similar systems existed in many parts of the world before they came into use in the US. For instance, cities in Europe had postal district numbers that went after the city and before the state in addresses; these were essentially precursors to today's ZIP code system. In 2015, Ireland introduced a new postal code system called Eircode that has seven digits that identify the location of an individual address.
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