tm_uuid Function 
tm_uuid generates a unique identifier string.
The id is a generated and formatted as required by RFC 4122 section 4.4, producing a Version 4 UUID. The result is a UUID generated only from pseudo-random numbers.
This function produces a new value each time it is called, and so using it directly in resource arguments will result in spurious diffs. We do not recommend using The tm_uuid function in resource configurations, but it can be used with care in conjunction with the ignore_changes lifecycle meta-argument.
In most cases we recommend using the random provider instead, since it allows the one-time generation of random values that are then retained in the Terraform state for use by future operations. In particular, random_id can generate results with equivalent randomness to The tm_uuid function.
Examples 
tm_uuid()
b5ee72a3-54dd-c4b8-551c-4bdc0204cedbRelated Functions 
- tm_uuidv5, which generates name-based UUIDs.