This guest lecture offers an in-depth exploration of Bus Architecture and Instruction Formats in Computer Organization. Students will gain insights into the structure and functioning of data, address, and control buses, and understand how communication occurs within a computer system. The session will also cover various instruction formats—zero, one, two, and three-address formats—and explain how instructions are encoded and executed by the CPU. Through real-world examples, diagrams, and interactive discussions, the lecture bridges theoretical concepts with practical applications in modern computer systems.