CDs (compact discs) and DVDs (digital versatile discs) are optical discs that use lasers to read and write data. CDs and DVDs are similar in shape and size, but they have different capacities.

A CD can store up to 700 megabytes of data, while a DVD can store up to 4.7 gigabytes of data. CDs and DVDs are often used to store music, movies, and other multimedia files.

CDs and DVDs are also used to store software applications and operating systems. CDs and DVDs can be used to install software on a computer, or to reinstall software that has been …