1.2.23

Data Compression

Test yourself

Types of Compression

Representing audio, images, and especially video take up a lot of secondary storage space. Compression helps to reduce the size of these files so that we can store more data.

Illustrative background for Lossy compressionIllustrative background for Lossy compression ?? "content

Lossy compression

  • An algorithm is applied to remove unnecessary detail from the original file.
  • Some data is permanently lost, but enough remains so that the file is still useful and there is barely a noticeable difference.
  • Lossy compression results in dramatic file size reduction.
Illustrative background for Lossless compressionIllustrative background for Lossless compression ?? "content

Lossless compression

  • None of the original data is lost.
  • An algorithm can be used to perfectly restore the original file when needed.
  • This is especially useful for executable files, where all of the data is necessary.
  • Lossless compression causes file size to reduce moderately.

Jump to other topics

1Computer Systems

1.1Systems Architecture

1.2Memory & Storage

1.3Computer Networks, Connections & Protocols

1.4Network Security

1.5Systems Software

1.6Ethical, Legal, Cultural & Environmental Concern

2Computational Thinking, Algorithms and Programming

Go student ad image

Unlock your full potential with GoStudent tutoring

  • Affordable 1:1 tutoring from the comfort of your home

  • Tutors are matched to your specific learning needs

  • 30+ school subjects covered

Book a free trial lesson