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"Hello, World!" program
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<p> A "Hello, World!" program is usually a simple computer program that emits (or displays) to the screen (often a <a href="/facts/Console_application/Gkr3u58Y">console</a>) a message similar to "Hello, World!". A small piece of code in most <a href="/facts/General-purpose_programming_language/LyA5zR3M">general-purpose programming languages</a>, this program is used to show a language's basic <a href="/facts/Syntax_(programming_languages)/zM5oInza">syntax</a>. Such a program is often the first written by a student of a new programming language, but it can also be used as a <a href="/facts/Sanity_check/4l0uVCdR">sanity check</a> to ensure that the <a href="/facts/Computer_software/RP79lVSW">computer software</a> intended to <a href="/facts/Compiler/WNfCDFJe">compile</a> or run <a href="/facts/Source_code/o9J6Jv23">source code</a> is correctly installed, and that its operator understands how to use it. </p>