Define negotiable instruments and explain their characteristics and types under the Negotiable Instruments Act 2034.

The instrument's definition: the negotiable instrument = the document of title to money, transferable by delivery (or endorsement-and-delivery), the holder-in-due-course's title free of defects — the credit's currency (the commercial paper). The characteristics: the transferability (the free negotiation); the title's magic (the holder-in-due-course's clean title (the better title than the transferor's — the negotiability's gift)); the presumption-of-consideration; the speedy remedy (the summary procedures).