Distinguish between the following: Promissory Note and Bill of Exchange.

Promissory Note: A "promissory note" is defined by Section 4 of the Negotiable Instruments Act, 1881 as "an instrument in writing (not being a bank note or a currency note) containing an unconditional undertaking, signed by the maker to pay a certain sum of money only to, or to the order of, a certain person, or to the bearer of the instrument". For Example, if A signs instruments in the following terms, it is promissory note: "I promise to pay B or order ₹500." "I acknowledge myself to be indebted to B in ₹1,000 to be paid on demand for values received." Bill of Exchange: According to Section 5 of the Negotiable Instruments Act 1881, the bill of exchange is defined as "an instrument in writing containing an unconditional order signed by the maker, directing a certain person to pay a certain sum of money only to the order of the certain person or to the bearer of the instrument." Bill of exchange means a bill drawn by a person directing another person to pay the specified sum of money to another person. A bill of exchange is of real use if it is accepted by the person directed to pay the amount. For example, X orders Y to pay ₹50,000 for 90 days after date and Y accepts this order by signing his name, then it will be a bill of exchange.