Planning is the basic function of management and involves determining courses of action to achieve desired goals. It bridges the gap between the present and the future by anticipating future possibilities and relating today's events to tomorrow. Planning is a systematic process that involves establishing objectives and premises, choosing alternative courses of action, formulating derivative plans, securing cooperation, and following up on plans. The key advantages of planning include facilitating management by objectives, minimizing uncertainties, improving coordination, and enhancing organizational effectiveness and efficiency. While planning provides structure, some disadvantages are that it can become rigid and time-consuming and plans may not always reflect changing realities.