What is the main difference between 'mono' and 'stereo' sound?

The distinction between mono and stereo sound primarily lies in the number of audio channels utilized. Mono sound uses a single audio channel, meaning that all sound is mixed together and played back through one output. This results in a cohesive, singular audio experience, where all elements are heard in the same way regardless of the listener’s position.

In contrast, stereo sound encompasses two channels, which allows for a more immersive auditory experience. With stereo, sound can be differentiated from the left and right speakers, creating a spatial quality that can mimic how we hear sounds in the real world. This separation of channels enables different audio elements to be placed at various points in the stereo field, enhancing the listener's perception of depth and dimension in the sound.

The other choices do not accurately reflect the key difference between mono and stereo. For instance, the claim that mono sound is of higher quality than stereo is subjective and not based on the channel structure, while stating that mono includes background music and stereo does not misrepresents the use of these formats in audio design. Additionally, the idea that mono sound is specifically for live performances while stereo is solely for recordings overlooks the versatility and application of both formats in various contexts.