What's the difference between slide film and negative film?
Negative film gives you a negative. The tones are reversed (shadows are clear, whereas highlights are solid, and the colours are both heavily masked orange, and reversed - red in the original scene are cyan in the negative, greens in the original scene are magenta in the negative, etc.
You need to either scan and invert a negative or (ideally) print a negative to get a recognizable final product. Until recently, the films you saw in a movie theatre were almost inevitably edited to a negative, and then printed on projection stock.
Slide films give you a positive as a final product. Ideally you project or view a slide directly, although you can print them (Ilfochrome - costly, discontinued, but special) or scan them and print from the scan.
If you have never seen a well projected slide, you should seek one out.
Slide film is more demanding when it comes to exposure - similar to digital.