Cash with order refers to a payment method where the buyer pays the full amount of the purchase upfront at the time of placing the order. This is commonly seen in business-to-business transactions and is beneficial for the seller as it ensures immediate payment and reduces the risk of non-payment. It also provides the buyer with a sense of security as they have already paid for the goods or services. However, this may not be feasible for all buyers as it requires a significant amount of cash upfront. As a result, alternative payment methods such as credit or installment plans may be offered to accommodate different financial situations.