function returns a human-readable string containing a universally unique identifier (UUID), also referred to as a globally unique identifier (GUID). This is a 36-character string that will be formatted in groups of 8, 4, 4, 4, and 12 characters, separated by hyphens. For example:
This is a string representation of a 128-bit number that can essentially be considered globally unique. The probability of generating the same UUID twice is near zero. You will receive a different string every time you call the function.
The function returns a string containing the human-readable representation of the identifier.