What is the purpose of DISPLAY NAME vs DESCRIPTION?

[elco]

I would have thought that display name would have been like help text you see if you hover over some field or like placeholder text when you don’t have a value in field. But it replaces the Headering text.

The order of precedence seems to be:

1. NAME (which can be different than column header in the sheet)
2. DESCRIPTION
3. DISPLAY NAME

But they all replace the same “place” so why do we need 3?