A Yard Management System (YMS) is a logistics tool used to manage the movement, location, and status of trailers and containers within a distribution center's yard. CLT 4.0 describes YMS as an extension of warehouse management, providing real-time visibility into trailer positions, load status, and dock assignments. It coordinates yard jockey movements and reduces congestion, dwell time, and detention fees. Unlike an IMS or ERP-which manage inventory or enterprise data-YMS specifically enhances outbound/inbound trailer efficiency. It often integrates with WMS (Warehouse Management System) and TMS (Transportation Management System) for seamless dock scheduling and carrier communication.