GUID is a global unique identifier. It is based on 128 bit. And it is mostly used in computer systems. GUIDs are used to generate unique identifiers and having the two same exact GUID is quite low chance.
If you use extra functions like Uppercase, Hyphens and Braces, generating the same GUID is very low.
You can create more GUIDs here to use it as a primary key in your database or test purposes in your application.
From the text box above, you can select the number of GUIDs that need to be generated so that you can do bulk uploads into your system.