Demand planning is a supply chain planning process that forecasts customer demand for products and services. The goal of demand planning is to ensure that the right products are available in the right quantities at the right time to meet customer demand. Demand planning involves estimating future demand, forecasting how much of each product will be needed, and determining when and where to manufacture or purchase products to meet customer demand. It also includes setting inventory targets and creating orders to bring products in line with forecasted demand.