35mm cameras are still used today by expert and apprentice users

Before the technology of today's digital cameras and high mega pixel resolutions, their was a time when film production was more of an art and talent that very few had the skill for. Film production companies, the film industry and even local photographers were highly respected and needed. But now with today's instant everything and cellphones with cameras....anyone can "snap a picture" and post it on the internet through their facebook page or on the highly popular video sharing website youtube. This new age of microprocessors and integrated circuits that could fit a vast amount of technolgy / information on the head of a pencil eraser. This type of revolutionary advanced developments have made the once highly valued photographer, more of a victim of his own trade....a "snap shoot frozen in time"    
SLR Cameras. This camera uses the 35mm film and even accepts lenses that are inter-changeable. The Single lens reflex cameras were the most expensive of the three non digital cameras dicussed here. They were named such because it is a single lens is what brings the identical image to the film and so to the user as he / she looks through the viewfinder. With ease of use the user only needs to focus the lens, this camera has exposures that are controlled by the built in light meter.  
Cassette and disc cameras, are suitable units for snapshots they are cheap and easy to operate. These cameras use disc film or 110 film cassettes that drop inside the camera. The type of lenses are normally fixed to focus from 4 feet to infinity. Some of them give you limited control over the settings for exposure.
The point and shoot cameras during their release were somewhat more expensive than cassette cameras. These cameras were great as they produced wonderful slides or prints using 35mm film. Because of the built in light meter aperture and shutter speed are set automatically.

Skilled photographers are knowledged of how film and film speed are interpret as this was a necessary knowledge-base of the user for the cameras of years ago. A film's speed ability to respond to light is indicated by the ISO (or Asa) this number is indicated on the box or roll. The variations of film would be slow from, ISO25 to 100 this is for light and activity to ISO200 to 1000 this is for fast action and or low lighting.
Selecting the proper Camera lenses is essential. It is true that photographic lenses vary from as simple as a single piece of polished plastic in some of the cheapest cameras to a dozen or more carefully ground and coated glass elements. The SLR cameras normally come with a 50mm focal-length lens that produces pictures with a "normal" 47 degree angle of view (this is an angle that is very similar to what the human eye detects). The lenses are interchangeable that range from a fish-eye 8mm and gives a 180 degree panorama to a 1000mm telephoto and takes in about 2.5 degrees and brings in subjects from the distance.    

These older style cameras are still used today for some jobs and by photographers although the cameras of today are indeed faster and more effective for some tasks. Even some of the professional digital cameras are lacking some of the abilities of cameras of earlier years. Many people believe that a digital slr camera could be competitive to that of a analog or standard 35mm camera.