More than just a logo, your brand is the embodiment of everything customers percieve about your business, from their website experience to the fancy packaging that protects their delivered products. Branding is the art of capturing that perception in a symbol of recognician and trust. Whether that takes the form of visual, audio or some other sensory medium, branding demands consistency with every interaction you have with customers.
Your logo and corporate theme are the visual linchpin of your brand. It can and should be applied to all external documents and materials, starting with letterheads, business cards and of course your website.