GUID stand for Global Unique Identifier which providing a special type of identification. The GUID is widely used in the software, web applications, database servers, memory allocation a name of few. This provides a unique number which will never generated twice. The GUID represents a hexadecimal character string and have 32 standard characters. This usually stored as a 128 bits
There are many different ways to generate the GUID.
Using Visual Studio 2008.
Go to Tools menu, click Create GUID and window will be pop up.
Using Power Shell,
$guid = [system.guid].newguid()
Using web browser: