This document defines and explains negotiable instruments. It begins by stating that a negotiable instrument is a written document that entitles the holder to a sum of money and can be transferred through delivery or endorsement. It then lists the key characteristics of negotiable instruments, including being freely transferable and the holder having clear title. The document goes on to define the main types of negotiable instruments - promissory notes, bills of exchange, and cheques - and explains the essential components and parties involved in each.