Cross sectional elevation question

I am brand new to the DD world (<1 month) and I have a question. My apologies if this has already been answered somewhere.
When I produce an elevation map and use the distance tool to produce a cross section of an area I can see the graph there representing the elevation change, and on the Y axis there is elevation in feet listed. Does anyone know where those values are coming from?
I feel fairly confident that it is not feet above sea level…

Hi Bryan,

Elevation is calculated from the point where you take off. Please let me know if this support doc helps: