Although both CD and DVD have the same media size and shape, the similarity ends there. There are numerous points of difference between the two, as listed below:

Data pits and lasers

A disc has microscopic grooves that move along in a spiral around the disc. Both CDs and DVDs have these grooves. Laser beams are applied to scan these grooves. As you may be aware, digital information is represented in ones and zeroes. In these discs, very tiny reflective bumps (called