This document provides an overview of guerrilla marketing. It defines guerrilla marketing as unconventional marketing techniques used by smaller companies to promote themselves against larger competitors. The document outlines several principles and methods of guerrilla marketing including using stickers, demonstrations, mystery, and viral tactics. Examples are given such as a gym promoting itself through interactive bus stop scales and a movie using an immersive subway marketing campaign. The summary emphasizes guerrilla marketing as a cost-effective way to creatively engage customers through unexpected promotional actions.