!!! Overview
[{$pagename}] ([GPIO]) is a generic pin on an integrated circuit or computer board whose behavior—including whether it is an input or output pin—is controllable by the user at run time.

[{$pagename}]s is NOT Standardized and varies based on the platform or vendor.

[{$pagename}] pins have no predefined purpose, and go unused by default.

[{$pagename}]'s idea is that sometimes a system integrator who is building a full system might need a handful of additional digital control lines—and having these available from a chip avoids having to arrange additional circuitry to provide them.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [General-purpose_input/output|Wikipedia:General-purpose_input/output|target='_blank'] - based on information obtained 2017-12-08-