What is the importance of marketing plan in conducting any B2B or B2C business?

Marketing Plan plays an integral role in conducting ANY kind of business. That can be small scale or large scale business.I believe that no business can earn maximum profit without a Marketing plan. 

Marketing Plan is the backbone for conducting any business. Without the plan mostly likely the business may reach a dead end. Reach out is mandatory.

Planning is needed in every aspect of our professional and social lives,i like the saying "if you don't plan then you plan to fail"

In marketing a marketing plan is the blue print that is needed to know what to do,whom to target,..etc.