It depends how you want to use the business plan.

1. to the bank, lender, creditors, etc for more loan/ credit
2. to investors for equity investment
3. to Govt or similar for grants or licenses approval
4. to plan & submit offically as per management requirement
5. to plan in the mind for quick start and search of direction
6. to plan to share with partners so everyone can coordinates well
7. to plan for long-term vs short-term

All the above can consider a business plan, but the format, style, content, presentation, and communication are very different.
What are you looking at?