I used to buy a cd to watch movies at home. Later, CDs were gradually replaced by some storage devices such as USB flash drives. The lyrics in a very popular song "Because of Love" say, "Give you a cd of the past and listen to our love at that time". The cd here should be a music CD. Because of the popularity of the internet, CD began to decline and slowly withdrew from the historical stage.

It also represents love.

There are also the following related explanations:

The CD that gamers often say means something else. The English name is cool down, which is the abbreviation of skill cooling time. Generally speaking, when playing games, there is a cooling-off period for heroes to release their skills. After releasing a skill once, they need to wait a few seconds before releasing it again.

For example, a game user said: My big move is in the CD, and I can't enlarge it now, until the cooling time of my big move has passed.