A business plan is a written document, typically 25 to 35 pages long, outlining the goals and strategy of a new venture, serving as a guide for employees and a pitch for investors. It should follow a conventional structure, include essential sections such as an executive summary, company description, industry and market analysis, marketing plan, management team, operations plan, product development, and financial projections. Effective business plans adapt as new insights emerge and must communicate a compelling narrative to attract investment.