Direct coupling is a method used in mechanical and electrical systems where two components are connected directly without any intermediary parts. This connection allows for efficient transfer of energy or motion, minimizing losses that can occur with additional components. For example, in a motor and gearbox setup, direct coupling ensures that the motor's output directly drives the gearbox, enhancing performance. In electrical systems, direct coupling can refer to connecting two circuits directly, allowing signals to pass without any filtering or amplification. This technique is often used in audio equipment to maintain signal integrity, ensuring that the sound quality remains high without distortion.