What is an UUID
Uniformly unique identifiers (UUIDs) are 128-bit numbers that are used to identify information in computer systems. The term global unique identifier (GUID) is sometimes used as well. A UUID is a digital identifier that is globally unique as its name implies, and it does not depend on a central registry or coordination for its uniqueness. A UUID has an extremely low chance of duplication, so low that it is considered 0 by the UUID community. Information labeled with an UUID from independent sources can later be combined to create a single dataset or database without any conflict. There are different versions for the UUID's. A UUID version 1 is generated from a time and node id, which is usually the MAC address. A UUID version 2 is generated from an identifier, which is most likely a group or user id, from a time and a node id. A UUID version 4 is generated by generating a random number.
