A business plan has two primary purposes. First, and foremost, it should be used to help run your company with a more cohesive vision. It is your roadmap. By truly analyzing your plan for marketing, sales, manufacturing, website design, etc., you greatly improve your chances for success.
As a communication tool, it is used to attract investment capital, secure loans, convince workers to hire on, and assist in attracting strategic business partners. The development of a comprehensive business plan shows whether or not a business has the potential to make a profit.