What is the difference between mnemonic codes and machine codes?

Machine code/language: the numeric codes for the operations that a particular computer can execute directly.The codes are strings of 0s and 1s, or binary digits, which are frequently converted both from and to hexadecimal (base 16) for human viewing and modification.Example: 10011A programming code that is easy to remember because the codes resemble the original words,such as MPY for multiply and ACC for accumulatorSource: Britannica.com