Before the color printer, before the camera phone, before digital camera there was the Dark Room. The dark room is the room where you take the negatives from a film camera, process them and turn them into prints. In the dark room you can create a 4X6 print just as easily as 11X13 no special wide formate printer. The equipment Stays the same.

The difference between Film and Digital today is the process. To process film we use chemicals like kodak d'76 Developer. To bring the photo out of the negatives. 

The negatives in film have different qualities. These are known as ISO or ASA. A role of film with an ISO of 50 will produce a very clear photo but you need have a lot of light. This Type of film would be good for outdoor photography on a sunny day. The reason this is is because film with an ISO of 50 has a very fine film grain. so fine that when we look at the prints our eyes can not see it. 

The opposite is true for an ISO of 3200. This film has a large grain that very visible to the eye. when looking at these prints you would see lots of dots close together. So why use it? Because with a high ISO you can shoot at night with low light, or in rooms with few bright lights. Because the film grain is so much larger than an ISO of 50 it is more sensitive to light, at the cost of quality.