In 1885, George Eastman introduced "film" in a form we would recognize today—a roll of photographic emulsion that could be run through a camera. (It did use paper as its backing, which was problematic, but still, roughly the same idea we continued to use for more than a hundred years.) Prior to Eastman's invention, the typical method for making a photograph involved using a plate negative, which was fragile, expensive, and involved a lot of chemistry by the photographer. So he fixed it.
In this video, Bill Hammack tells the basics of George Eastman's story and how he created the classic Brownie camera that brought photography to the masses. Enjoy:
If you want a much deeper dive, check out the American Experience documentary George Eastman: The Wizard of Photography.