Cd

A compact disc (CD) is a digital optical disc data storage format, developed in 1979 by Philips and Sony, and released in 1982. CDs primarily store audio recordings, but can also store digital data. They are made of polycarbonate plastic and are read by a laser beam that interprets the pits and lands on the disc surface as binary data. They were a popular medium for music and data storage before the rise of digital downloads and flash memory.

Cd meaning with examples

• My music collection was primarily on CDs back in the day. I'd spend hours organizing them and listening to them on my Discman. I remember buying my favourite artists' albums on the day they were released. Now I have everything on my phone with the Cd collection gathering dust in the attic, which is a shame.
• The archaeological team discovered an ancient Cd in a buried chamber. They sent the Cd to the lab, and began to analyze the data that was found on it. It turned out the data contained information of the lost world. They quickly began to find new treasures and history of the world.
• Before the internet, software was often distributed on CDs. When you bought a new program, it would arrive on a Cd, usually in a glossy, box. Installing the software was a long process. It took many minutes to transfer from the Cd to the computer, before getting to use it.
• I had to teach my kid about CDs and what they were since CDs are out of date, so it was interesting to show them how to play the CDs in a Cd player, compared to just downloading music.