The globally unique identifier (GUID) data type in SQL Server is represented by the `uniqueidentifier` data type, which stores a 16-byte binary value. A GUID is a binary number, and its main use is as ...

If you are asking “GUI-what?”, not to worry, you aren’t alone. A GUID is a Globally Unique Identifier that helps manage the relational data in the Common Data Service for Apps and SQL Server.