Question

why cd is different from a DVD

Answer 1

DVD, short for Digital Versatile DISC, is also an optical medium to store digital data. A standard DVD can hold 4.7 GB of data. So DVDis widely used to store large files like video and movies. The capacity is the biggest difference between CDand DVD

Answer 2

because CD is like a pen drive but the shape is round and they can't attatch with phone then we have to need dvd