GUID (or UUID) is an acronym for ‘Globally Unique Identifier’ (or ‘Universally Unique Identifier’). The term GUID is generally used by developers working with Microsoft technologies, while UUID is used everywhere else.
GUIDs identify objects such as interfaces, manager entry-point vectors (EPVs), and class objects. A GUID is a 128-bit value consisting of one group of 8 hexadecimal digits, followed by three groups of 4 hexadecimal digits each, followed by one group of 12 hexadecimal digits. The following example GUID shows the groupings of hexadecimal digits in a GUID: 6B29FC40-CA47-1067-B31D-00DD010662DA
It’s nearly impossible for the numbers generated for the GUID to have two numbers repeated making them unique.
This tutorial will show you how to quickly generate a new Globally Unique Identifier (GUID) in Windows 7, Windows 8.1, and Windows 10.