DVD
device · 1995 · Digital age
An optical disc for video.
What it is made of
- Clear polycarbonate disc — has part. Two halves glued together with tracks.
- Reflective metal layer — has part. A metal coating.
Principles and materials it uses
- Plastic — is made of. The disc is polycarbonate.
- Aluminium — is made of. The reflective layer is aluminium.
- Laser diode — uses. It is read by a red laser.
History: what it evolved from and what it influenced
- Video recorder — evolved from. A replacement for video cassettes.
What it is a kind of
- Optical disc (CD/DVD) — is a kind of. An optical disc.