Process costing is an accounting method used to determine the cost associated with producing each unit of a product. The weighted average method process costing is a specific technique within this approach. This method divides the total cost of production for a period among all the units produced in that time, using an average cost for each unit. This technique is useful when the production process creates multiple products at the same time and cannot easily allocate materials and labor costs to individual products. By taking into account fixed costs, variable costs, and overhead expenses, businesses can accurately track costs and make data-driven decisions on pricing and profitability.