Job Vs Unified Job

What is the distinction between a job and a Unified Job? In the documentation there is a section on Unified Job Templates but it doesn’t seem to define what a Unified job is: https://docs.ansible.com/ansible-tower/2.3.0/html/towerapi/unified_job_template.html

No idea, but on the dedicated awx-project mailing list someone might know
(this is the ansible-project list).

Thank you I will post that there.