Your website, brochures, advertisements and even your logo are speaking when you're not around to talk with your customers.
Make sure the message they're delivering is consistent with your vision of your company, employees and products and make sure they're consistent with each other.
A well constructed brand bible will ensure your products, packaging and advertising are talking the same language whether your presenting them in person or they're in your client's hand on opposite end of the globe. If your company is expanding or has plans to expand in the future branding will ensure clients see your business as a whole and provide a guide for your new branche's path into new markets.