Photographic cameras have improved since the 1840s. Roll film was invented in 1882. The electric motor-driven film-advance feature was introduced in 1969. Camera bodies have become progressively smaller and lighter.
For more than 150 years after its invention, the fundamental concept and technology of photography remained unchanged. Images were recorded through the action of light on light-sensitive silver compounds.
Digital photography developed in the 1980s. The blend of traditional photographic technology with digital defines an exciting new era in photography. Today digital photography is widely practiced by professional and amateur photographers.