The Enneagram refers to the nine different types or styles, with each representing a worldview and archetype that resonates with the way people think, feel and act in relation to the world, others and themselves. It is much more than a personality profile that offers insight into core personality traits, as it delves deeper into the core motivations, defence mechanisms and fears that often lie in the unconscious layers of our personality structure. Your Enneagram core type is like a home base from which we make sense of individuation, integration and development. Other words used to describe the idea of 'type' include resonance, identification, lens, perspective or style.
It is important to keep in mind that different Enneagram styles may display similar behaviour. The Enneagram styles are not based on behaviour alone, and outward behaviour can be deceiving when exploring the Enneagram. To distinguish between styles, it is important to access motivation - to explore why a person chooses to act in a certain way and why acting in that way is valued by that individual.