A promissory note is an unconditional written promise by a maker to pay a specified sum of money to a payee or bearer. Essential elements of a promissory note include being in writing, containing an express and unconditional promise to pay a definite sum of money, being signed, identifying the maker and payee clearly, and being properly stamped. The key parties are the maker, who promises to pay, and the payee, to whom payment is made.