Answer:
The sensor: The most obvious difference between film and digital is the sensor used to take the photo. With film cameras a film sensitive to light is placed behind the lens. When a photo is taken the shutter opens for a predetermined period of time and light hits the film. The result is a photo "printed" on the film.
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In broad terms, the writing process has three main parts: pre-writing, composing, and post-writing. These three parts can be further divided into 5 steps: (1) Planning; (2) Gathering/Organizing; (3) Composing/Drafting; (4) Revising/editing; and (5) Pro ofreading.