A universally unique identifier (UUID) is a standardized 128-bit format for identifying information in computer systems. UUID version 4, also known as a randomly generated UUID, is one of several versions of UUIDs that are in use today.
UUID version 4 is generated using randomly generated numbers, as opposed to being derived from a combination of computer hardware information and a timestamp, like other versions of UUIDs. This means that UUID version 4 is not guaranteed to be unique across all systems, but the likelihood of a collision (two UUID version 4 values being the same) is extremely low.
One of the main benefits of using UUID version 4 is that it allows developers to generate unique identifiers for objects or data without the need to store any additional information. This can be particularly useful in distributed systems where multiple systems may need to generate unique identifiers for the same data.
UUID version 4 is represented as a string of 32 hexadecimal characters, divided into five groups separated by hyphens. The first group is 8 characters long and consists of a randomly generated hexadecimal value. The second group is 4 characters long and also consists of a randomly generated hexadecimal value. The third group is 4 characters long and consists of a randomly generated hexadecimal value. The fourth group is 4 characters long and consists of a randomly generated hexadecimal value. The fifth group is 12 characters long and consists of a randomly generated hexadecimal value.
Here is an example of a UUID version 4: "b5a3c02e-f5d5-4b7d-b5f5-8e073c4b4d4c"