Am I just tired or is it burnout? Here's how to tell the difference

As we head into silly season with the realisation that there are only so many weeks left in the year, many of us are trying to motivate ourselves for that one last push to get through things before everyone shuts down while at the same time feeling like we are hanging on by our fingernails.

Are we just exhausted from what feels like a long year, or is it something else that is leaving us feeling mentally and physically depleted? How do we know if we're tired or if we are experiencing burnout?

What is burnout?