Materials like insulation placed in walls and ceilings can help provide a barrier to the entry of sound from the outside or other rooms.
Insulation is an excellent sound absorber.
It is also well within the budget of homeowners. Installing insulation is easy when you're remodeling or renovating. And, when buying a new home, make sure to ask your builder about insulating for sound control. Interior sidewalls are especially important to insulate in order to keep noise from traveling between rooms. Don't forget your garage walls either - this will keep the sound of a car starting out of your living area.