A "Trade-In" is a process where a customer exchanges an old item, such as a car or electronic device, for credit towards the purchase of a new item. This practice is common in retail and automotive industries, allowing customers to reduce the cost of their new purchase based on the value of their old item. The value of the trade-in is typically assessed by the seller, who may consider factors like the item's condition, age, and market demand. This can make upgrading to newer models more affordable and convenient for consumers, while also helping sellers manage inventory and attract customers.