Compact Disc (CD) is a digital optical disc storage medium that revolutionized the music industry. It is represented by the symbol 💿 and has become an iconic representation of audio recordings. CDs offer high-quality audio playback and have a capacity to store up to 700 MB of data. They are widely used for music albums, software distribution, and data storage purposes. The shiny surface of a CD reflects light to read the digital information encoded on it, allowing for precise and accurate playback.