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3.3 Data RepresentationIntroduction

The Travel Packing Problem

Part of Compression · GCSE GCSE Computer Science revision

This introduction covers The Travel Packing Problem within Compression for GCSE Computer Science. Revise Compression in 3.3 Data Representation for GCSE Computer Science with 16 exam-style questions and 16 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 1 of 12 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 12

Practice

16 questions

Recall

16 flashcards

The Travel Packing Problem

You're packing for a trip. Lossless packing: You vacuum-seal clothes to remove air - they're smaller but unfold perfectly. Lossy packing: You leave your winter coat home and pack a thin jacket instead - much lighter, but not quite the same. Lossless compression is like vacuum-sealing - you can get the exact original back. Lossy compression is like leaving stuff behind - the result is good enough but some detail is permanently gone. Photos, music, videos = usually lossy (you won't notice). Documents, programs, medical scans = always lossless (need exact original)!

Keep building this topic

Read this section alongside the surrounding pages in Compression. That gives you the full topic sequence instead of a single isolated revision point.

Deep Dive: Why Compression MattersLossless Compression - Perfect RecreationRun-Length Encoding (RLE) - Simple Lossless

Practice Questions for Compression

Which statement correctly describes lossy compression?

  • A. The original file can be perfectly restored after decompression.
  • B. Data is permanently removed and the original cannot be exactly recreated.
  • C. The compressed file is always the same size as the original.
  • D. No data is removed during the compression process.
1 markfoundation

Explain how run-length encoding (RLE) works to compress data.

3 marksstandard

Quick Recall Flashcards

16 questions on Compression — practise free

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Deep Dive: Why Compression Matters