Why are walls covered with soft material in recording studios?

In short, this is done in order to “absorb” extraneous noises and so that the sound of only one singer or voice-over of cartoon characters is well and clearly heard in the microphone. Usually the walls of a recording studio are covered with something like foam rubber. This foam is usually cut in the form of thorns or triangles. Since sound is oscillating waves, these foam spikes “break” these waves and absorb the sound. Of course, we are talking about extraneous sounds, rustles, etc. Thus, the sound of only one person becomes clear and clear.