Analog: In telecommunications, analog refers to the transmission of voice, video, or data through continuous signals that vary in frequency or amplitude in response to changes in sound or light. Traditional landline telephones, for instance, convert voice sounds into electrical signals that mimic the sound waves. These analog signals can be transmitted over copper wires and are subject to degradation from noise and distance, contrasting with digital signals, which can be more easily cleaned and amplified. While much of modern telecommunications has shifted toward digital technologies for their efficiency and fidelity, analog technology is still in use in various capacities, such as radio broadcasting and certain audio systems.