A marketing calendar is a strategic tool used by businesses to plan, organize, and schedule their marketing activities over a specific period, such as a month, quarter, or year. It outlines key dates, campaigns, promotions, content releases, and other marketing initiatives, ensuring that efforts are aligned with business goals and seasonal trends. The calendar helps teams coordinate their actions, track progress, and manage resources effectively, enabling them to maintain consistency and optimize the timing of their marketing efforts for maximum impact.