What is the difference between mnemonics and opcode?

Mnemonics are human-readable representations of machine language instructions, designed to make it easier for programmers to remember and write code. For example, in assembly language, a mnemonic like "MOV" indicates a move operation. In contrast, an opcode (operation code) is the binary or hexadecimal code that the computer's processor understands and executes directly. Essentially, mnemonics serve as a shorthand for opcodes, bridging the gap between human language and machine language.