write the difference between a DVD and a CD
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Answer:
The CD (Compact Disc) was the first step towards the idea of digital encoding of the data. It uses a unique method of encoding in which a 14-bit code indicates a byte and this encoding technique also helps in error detection. It was a suitable replacement for the magnetic disk as it offered the low-cost solution for storing a significant amount of data.
The advent of DVD (Digital Versatile Disk) provided an alternative for the videotape used in VCR (Video Cassette Recorder) and CD-ROM used in PC as the DVD can acquire 7 times larger amount of the data relative to CD. It renders videos with excellent picture quality and random access. A DVD is built from the same material as the CD but the process and the layers are different, it is used from both of the sides such as two CDs are sticking together.
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