CDs (Compact Discs)

A CD (Compact Disc) is a circular, flat disc used to store digital information, primarily music or data. It uses tiny pits and flat areas on its surface to encode data via laser technology. When a CD player’s laser reads the disc, it detects the changes between pits and flat areas, converting these patterns into digital signals that can be played as sound or accessed as data. CDs typically hold about 700 MB of data or around 80 minutes of audio. They are a durable, portable, and widely used medium for distributing digital content.