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Below are the detailed explanation of the importance of the elements mentioned in the prior answer.

The opcode & Operands: This is the operational code. Think of the opcode as the binary numbers stored in memory. This opcode tells the Central Processing Unit (CPU) what to do. Machine code usually refers to instructions coded in bits (zeros and ones), and these bits are readable and executable by the CPU. Any program to the run on the computer must first be converted to machine code. You might have heard of the terms; binaries and executables.

Any complete machine language code contains opcode and operands. Each opcode performs actions on the operand. These actions can be inputting, adding as well as branching actions.

The Opcode can perform operations in one of the following categories:

1. Arithmetic and Logic Operations

2. Data transfer; movement of data from one register to another, or between memory locations and registers or visa versa.

3. Input/Output

4. Control

The source and destination operand references simply specify the input and output locations for the operation respectively. Remember that an instruction can involve one or more sources and destinations The next instruction reference is a pointer to next opcode.

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