This document defines and explains endorsement of negotiable instruments. It begins by defining endorsement as signing over the right to receive payment from a negotiable instrument to another person. It then discusses the key parties in an endorsement - the endorser who signs and the endorsee in whose favor it is made. The document outlines the essential requirements for a valid endorsement and various legal provisions and rules regarding endorsement. It concludes by defining and explaining the different types of endorsements including blank, special, conditional, restrictive, sans recourse, facultative, forged, and partial endorsements.