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.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2