This document defines and explains key concepts related to negotiable instruments. It begins by defining a negotiable instrument as a transfer of debt that can include promissory notes, bills of exchange, or checks. It then discusses the Negotiable Instruments Act of 1881 and the characteristics of negotiable instruments such as being freely transferable. The document goes on to classify instruments, define the different types including promissory notes, bills of exchange, and checks, and compare their key elements and parties. It concludes by covering negotiation, assignment, presentment, dishonor, notice procedures, and discharge of negotiable instruments.