Third-party fulfillment is a service where a company outsources its order processing and shipping tasks to another business. This third-party provider manages inventory, picks and packs products, and ships them directly to customers. This allows the original company to focus on other aspects of its operations, such as marketing and product development. Using third-party fulfillment can help businesses scale quickly without the need for significant investment in warehousing or logistics. Companies like Amazon and ShipBob offer these services, enabling smaller businesses to compete in the market by providing efficient and reliable delivery options.