What is the difference between a business plan and a budget?

A business plan is an overall look at a business that lists areas like product overview, marketing plan, action plan and it includes financial history (if any) and financial predictions; there fore a budget. So in terms of comparing these two in the same context, a budget is a subcategory of a business plan. when talking in general, a business plan gives a comprehensive look at a company and it's objectives, while a budget shows financial planning.