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Fundamentals of data representationGeneraldata representationcompression

AQA GCSE · Question 17.1 · Fundamentals of data representation

State two reasons why data are compressed.

How to approach this question

Think about the two main things we do with files: store them and send them. How does making a file smaller benefit both of these activities?

Full Answer

1. **To reduce storage space requirements:** Compressed files take up less space on storage devices like hard drives and SSDs. 2. **To speed up data transmission:** Smaller files can be transferred over a network (like the internet) more quickly, reducing download/upload times and using less bandwidth.
Data compression is the process of encoding information using fewer bits than the original representation. There are two primary motivations for this: 1. **To Save Storage Space:** Compressed data occupies less physical space on storage media such as hard drives, solid-state drives, or cloud storage. This allows more data to be stored in the same amount of space, which can also lead to cost savings. 2. **To Increase Transmission Speed:** When data is sent over a network (for example, downloading a file, streaming a video, or loading a webpage), smaller file sizes mean less data needs to be transferred. This results in faster transmission speeds, reduced latency, and lower bandwidth consumption, which is particularly important for users with slow or metered internet connections.

Common mistakes

✗ Vague answers like "to make it smaller" without explaining the benefit of it being smaller. ✗ Stating a type of compression (e.g., "lossy") instead of a reason for compression. ✗ Confusing compression with encryption.

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