!!! Overview
[{$pagename}] is a [international Organization for Standardization] ([ISO]) standard [Language Codes] — Part 1: Alpha-2 code, is the first part of the ISO 639 series of international standards for language codes. 

Part 1 covers the registration of two-letter codes.

Many multilingual web sites—such as [Wikipedia]—use these codes to prefix [URLs] of specific [language] versions of their [websites]: for example, en.Wikipedia.org is the English version of Wikipedia. 

The [IETF] [language-Tag]. ([Two-letter country-specific|ISO 3166-1 alpha-2] [Top-Level Domain] code suffixes are often different from these [language-Tag] prefixes).

[{$pagename}], the original standard for [Language Codes], was approved in [1967|Year 1967] and was split into parts, and in [2002|Year 2002] ISO 639-1 became the new revision of the original standard. 

The use of the standard was encouraged by [IETF] [Language-Tags], introduced in [RFC 1766] in March [1995|Year 1995], and continued by [RFC 3066] from January [2001|Year 2001] and [RFC 4646] from September [2006|Year 2006]. The current version is [RFC 5646] from September [2009|Year 2009]. Infoterm (International Information Center for Terminology) is the [Registration Authority] for [ISO 639]-1 codes.

New ISO 639-1 codes are not added if an ISO 639-2 code exists, so systems that use ISO 639-1 and 639-2 codes, with 639-1 codes preferred, do not have to change existing codes.

If an ISO 639-2 code that covers a group of [languages] is used, it might be overridden for some specific languages by a new ISO 639-1 code.

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