What's the differences between sound-absorbing cotton and sound-insulating cotton?

Sound-Absorbing Cotton: Made of porous materials (e.g., polyester fiber, polyurethane foam), it absorbs sound waves to reduce indoor echo and improve sound clarity. It is lightweight, easy to install (via pasting or hanging), but has limited ability to block external noise. It is widely used in studios, home theaters, and classrooms.

Sound-Insulating Cotton: Composed of high-density materials (e.g., mineral wool, glass wool, rubber), it effectively blocks external noise transmission (for both low and high frequencies). It has strong sound insulation but is heavier and more complex to install. It is suitable for residences, commercial buildings, and factories to create quiet environments.