Endorsement refers to signing one's name on the back of a negotiable instrument like a cheque in order to transfer ownership to another person. There are several types of endorsements - blank or general endorsement allows further negotiation by delivery, special or full endorsement specifies the next endorsee, and restrictive, conditional, sans recourse, facultative, and sans frais endorsements modify the endorser's liability. A valid endorsement must be made in ink, on the instrument, by a holder or maker of the instrument through their signature, and completed through delivery. Endorsement allows the transfer of rights, guarantees prior signatures, and makes the endorser liable if the instrument is dishonored.