Stock, in the context of supply, refers to the quantity of goods or materials that a business has on hand to meet customer demand. It includes finished products ready for sale, as well as raw materials and components needed for production. Managing stock effectively is crucial for businesses to ensure they can fulfill orders without overstocking, which can lead to increased costs. Maintaining an optimal level of stock helps businesses avoid shortages and delays, ensuring customer satisfaction. Various methods, such as inventory management systems and just-in-time (JIT) inventory, are used to track and control stock levels, allowing companies to respond quickly to changes in demand.