!!! Overview
[{$pagename}]  is any collection of computer instructions (possibly with comments) written using some human-readable computer language, usually as [text|Plaintext]. The [{$pagename}] of a [Application] is specially designed to facilitate the work of computer programmers, who specify the actions to be performed by a computer mostly by writing [{$pagename}]. 

[{$pagename}] is often transformed by a compiler program into low-level [machine code] understood by the computer. The machine code might then be stored for execution at a later time. Alternatively, an interpreter can be used to analyze and perform the outcomes of the [{$pagename}] program directly on the fly.

Most [application] softwares are distributed in a form that includes executable files, but not their [{$pagename}]. If the [{$pagename}] were included, it would be useful to a user, programmer, or system administrator, who may wish to modify the program or to understand how it works.

Aside from its machine-readable forms, [{$pagename}] also appears in books and other media; often in the form of small code snippets, but occasionally complete [codebase]s; a well-known case is the [{$pagename}] of PGP.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [source-code|Wikipedia:Source_code|target='_blank'] - based on information obtained 2016-07-04