The Pitch

Pitches come in two forms: the Single Sentence Pitch, also known as the teaser, and the Story Pitch

Single Sentence Pitch. The Challenge of the single sentence pitch is to sum up the storyline of your idea in around 25 words or less. This sentence is also known as "the hook", an example would be:

The Godfather
: The aging patriarch of an organized crime dynasty transfers control of his clandestine
empire to his reluctant son.

If you've crafted a good single sentence pitch, you will be asked to give a Story Pitch. This is where you can go over the storyline briefly from beginning to end. Focus on tow or three characters at most and the action, conflict, and emotions they will go through.

When giving a story pitch the most important thing to remember is What Will We See. It's not enough to tell us what happens. To approve a project, the producer has to know what is going to be shown on the screen. For example, if someone were to pitch a film in which a character is involved in a car accident, they will be asked to clarify whether or not the audience is going to see a car accident occur on the screen.

The story pitch can include supporting reference material, including, but not limited to storyboards, music, videos, or still pictures.

Wikipedia Links:
The Pitch
Film Treatment