How is a DVD read?

A DVD is read using a laser. The laser is directed at the DVD's surface, and it reads the data that is stored on the disc. The data is stored in the form of tiny pits and bumps. The laser reads the pits and bumps by reflecting off of them. The reflected light is then converted into an electrical signal, which is then processed by the DVD player.

The DVD player uses the electrical signal to create an image on the screen. The image is created by combining the data from the DVD with the data from the DVD player's memory. The DVD player's memory stores the information about the DVD's tracks, chapters, and other features.

The DVD player also uses the electrical signal to create sound. The sound is created by combining the data from the DVD with the data from the DVD player's audio decoder. The DVD player's audio decoder stores the information about the DVD's audio tracks, languages, and other features.

The DVD player is able to read the data from the DVD because the DVD is made of a material that is reflective. The reflective material is able to reflect the laser light back to the DVD player. The DVD player is able to determine the location of the pits and bumps by measuring the time it takes for the laser light to reflect back to the DVD player.