CD and DVD

I like music and movie. So, I often use CDs. And I sometimes use a DVD-R to record something. CD-R and DVD-R are widely famous. Maybe, it is used by many people in the world area. But CD and DVD have some differences. Let's compare.
First, the purpose to use it is various. If you want to record a music or photograph, you may use CD-R. On the other hand, if you want to record the movie, probably you use DVD-R.
Both DVD-R and CD-R are too light and slim, so it is easy to carry it. Since, they are very just not noticeable difference; I often take CD for DVD.
Although the looks style is same, the cost to get is too different. CD-R is sold in cheap a little price, while DVD-R is too expensive. So, I can’t buy DVD easily.
Like the DVD, CD is also sold in electric center or special store about computer.
Unfortunately, the most inconvenience difference I think is that each disc needs each disc player. The cost to buy each player is to high, many people drops the plan to buy those players.
But these days, personal computer made it possible to play these discs. So, I often use a computer to play the movie or music.