Pallet rack decking is a means of increasing the safety of your storage unit by creating a flat surface for your pallets to sit on. This not only prevents items from falling between the beams of your racks, but also increases the load capacity of your rack.
Decking comes in a variety of styles, such as wire decking, and open decking. These types of decking both increase fire safety by allowing sprinkler water to pass between levels. However, their varying designs mean one might not provide the support your product needs (i.e. if you were storing smaller bins and/or loose items you'd use different decking than if you were storing full pallets).