What is the difference between a patch and an upgrade?

General Product Information
A patch is a fix to and existing code version, an upgrade is an entriely new code version with new features and capabilities.
 
Example Firmware Detail:  x.y.z Build aaa
 
A patch is in the �aaa� or �z� range.
 
An upgrade/update (same thing) is in the �x� and �y� range.

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