Show your image ... your identity
The concept of corporate identity is akin to what we refer to when we talk about our own identity, the specifics that differentiate us from others. It is our personality and character that maintains our individuality, which we express through how we behave, speak, and even what we wear.
Similarly, a business makes itself distinct through the image that it presents to the world, through collateral like business cards, letterheads, brochures and other options. It is a physical expression of the company's brand, an extension of the culture that is already expressed through communication style and behaviour exhibited to maintain the image of the business.