How can music and movies be heard from disks?

Question

When they are broken down in elements, what exactly is stored on the disk? How is this translated into music or film?

Answer 1

What is stored on the disk is a digital code (numbers) that are used to represent individual pixels (in pictures) and tones (in music) when the code is matched to a table of values (a codex) When these pixel values are reassembled side by side, with matching line lengths, the human eye and brain interprets them as a picture. When multiple pictures are presented one after the other, the eye/brain interprets them as recording motion and blends the images. With sound, the codes might be a specific vibration - pulsing a speaker - or a code for playing a musical instrument - midi - where the ear/brain assembles the sound.