A marketing plan may be part of an overall business plan

Business plan

A business plan is a formal statement of a set of business goals, the reasons why they are believed attainable, and the plan for reaching those goals. It may also contain background information about the organization or team attempting to reach those goals....

.

Solid marketing strategy

Marketing strategy

Marketing strategy is a process that can allow an organization to concentrate its limited resources on the greatest opportunities to increase sales and achieve a sustainable competitive advantage.-Developing a marketing strategy:...

 is the foundation of a well-written marketing plan. While a marketing plan contains a list of actions, a marketing plan without a sound strategic foundation is of little use.
Marketing process can be realized by the marketing mix in step 4. The last step in the process is the marketing controlling.
In most organizations, "strategic planning" is an annual process, typically covering just the year ahead.