This Practice Note provides an overview of documents of title (and related documents) such as bills of lading, air waybills, sea waybills, and warehouse receipts. This Note describes the process by which these documents are issued and used and the purpose of these documents (for example, as evidence of their receipt of goods for transportation or storage services, and to serve as contracts of carriage or storage). This Note also discusses the differences between negotiable and nonnegotiable documents of title.