Today, most of us shoot digital which is an electronic process, but not that long ago, the photographic process was chemical in nature.
The George Eastman House created a series of short movies explaining the history and context of each of the major chemical processes. Starting with the Daguerreotype, through Collodion, Albumen Print, The Woodburytype, The Platinum Print, and finally the Gelatin Silver Print which is similar to the process used in black and white movie reels and modern 35mm film.
It is a great resource if you are seeking to learn a bit more of how photography was just ten years ago (but also 200 years ago). It is packed with interesting facts like the usage of eggs for producing Albumen Prints.