What's the difference between negative film and original film?

1. Difference between negative film and original film: There are differences in pixels, reuse and size between negative film and original film.

2. The negative has been roughly modified by the photography shop, and the pixels are destroyed, so it can't be reused, and it will be distorted if it is enlarged or reduced. However, the pixels of the original film can be reused without modification, and it will not be blurred if it is enlarged or reduced at will.