DXO Photo Lab works great with color negative scans

i was pointed to this post and, i think i am not in the same street here.(knowledge wise)
1 what is negative conversion? (like the old days of a roll of negative images developing to a picture?)
2 why would you want to convert a image scan? or are you scanning real strips of negatives?
3 i did looked at the nc01-05r and that’s it, what am i looking at?
(this is all out of interest, i am not having old negatives which i would like to scan.)
regards

Peter