FOB, or "free on board", is a shipping term used in contracts to determine who pays for transportation and when ownership of goods transfers between buyer and seller. The FOB location, such as origin or destination, determines when ownership transfers and who is responsible for transportation costs and filing claims for damage or loss. Modifiers like "prepaid" and "collect" further define whether the buyer or seller pays transportation charges. For example, FOB Origin means the buyer owns goods in transit and pays transportation, while FOB Destination means the seller retains ownership and pays transportation costs until delivery.