Sounds are a factor or consideration in selecting our homes and the things that go into them. There are the desirable sounds and the unwanted "noise". Houses have the sounds made by appliances and electronics, the sound made by the residents (talking, laughter, singing, yelling, playing, etc.), and the neighborhood sounds (for instance, bird songs, chimes, lawn equipment, traffic).
Some materials reflect and amplify sound while others absorb and dampen it. Insulation can protect one space from noise created in another space. For instance double glazed or insulated windows can reduce the amount of exterior noise that's heard inside. That can be useful for homes in a noisy environment.
Some neighborhoods and municipalities have rules about noise levels. The restrictions may be different for night (sleep time) than day times.