In fulfillment, it means the goods that are in active pick locations and ready for order filling (products that are stored in readily-accessible areas for easy order fulfillment.)
How to manage a large quantity of active stock?
A distribution center may opt to increase operating shifts. For example, use 3 shifts daily to be able to select orders from tens of thousands of active stock keeping units (SKUs). More importantly a distribution centre can use automated order fulfillment to increase distribution center productivity. This includes using for example horizontal carousels in the facility to ship out thousands of shipments per day.