UUID stands for Universally Unique Identifier. It is a standard for constructing software and is also part of the Open Software Foundation organization in the field of distributed computing environments. A UUID is a 128-bit number that can be calculated through a certain algorithm. For efficiency, the commonly used UUID can be shortened to 16 bits. UUID is used to identify attribute types and is considered a unique identifier in all spaces and times. Generally speaking, it can ensure that this value is truly unique, and any UUID generated anywhere will not have the same value. One advantage of using UUID is that it can create new identifiers for new services. The standard UUID format is: xxxxxxxx-xxxx-xxxx-xxxxxx-xxxxxxxx (8-4-4-4-12).