globally unique identifier (GUID - globally unique identifier), GUID is a 128-bit globally unique identifier (GUID - globally unique identifier), GUID is a 128-bit binary number (16 bytes), can be used for all needs to be unique Identifiers for computers and networks. There is a very small chance that this identifier is a duplicate. The format of the GUID is "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", where each x is a hexadecimal number in the range of 0-9 or af.