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What is Hello World?

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Hello world is a computer program that does nothing but print the words "Hello world." Programmers commonly use such programs as a basic sanity test that output or communication is working. In some cases, hello world is used to test other things. For example, a hello world in multiple languages can be used to test localization.
The practice of using hello world as a basic test extends back as far as 1974. This tends to occur naturally to programmers who may not be familiar with the practice. Given the need to say something in a test, hello world seems appropriate. Many programmers have a special fondness for hello world as it is often the first program that they wrote as a student.
Overview: Hello World
A program that outputs the text "Hello world."
Sanity testing of environments, equipment, output and communication.
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