DVDs work by storing data in the digital form (1s and 0s). It s represented as bumps and flats respectively. DVDs are made of aluminum and then coated with plastic that reflects the laser beam. The laser projects on the DVD which makes the bumps and flats on the DVDa reable. The laser beam projects on the DVD while the motor spins it to read it. DVD players have decoders that decodes the encoded data read by the laser.