What does post mortem mean

Post mortem, also known as autopsy, is where they examine a dead body to see what’s the cause of death.

They do this by opening the body and cutting open diff organs and such to see the cause and effects that led to their death.

If you’re looking at the business point of view, then post mortem means what they’ve conducted from their results from project.

For ex: was it successful, unsuccessful, risky, where does it need improvements and so on just so they know how to make it better next time.