Recall & Review
beginner
What is data compression?
Data compression is the process of making a file or data smaller so it takes up less space or can be sent faster.
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beginner
What is the difference between lossless and lossy compression?
Lossless compression keeps all original data and can be reversed exactly. Lossy compression removes some data to make files smaller but loses some detail permanently.
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beginner
Give a real-life example of data compression.
Zipping a folder on your computer to send it by email is like packing a suitcase tightly to fit more clothes in less space.
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beginner
Why do we use data compression?
We use data compression to save storage space, reduce internet data use, and speed up file transfer.
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beginner
What is an example of a lossless compression format?
PNG images and ZIP files use lossless compression, so no data is lost when compressed.
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Which of these is a key goal of data compression?
✗ Incorrect
Data compression aims to reduce file size to save space or speed up transfer.
Which type of compression removes some data permanently?
✗ Incorrect
Lossy compression removes some data to reduce size but cannot restore it exactly.
Which file format uses lossless compression?
✗ Incorrect
PNG images use lossless compression, preserving all original data.
What is a real-world analogy for data compression?
✗ Incorrect
Packing a suitcase tightly is like compressing data to fit more in less space.
Why is data compression important for internet use?
✗ Incorrect
Compression reduces file size, saving data and making downloads faster.
Explain the difference between lossless and lossy compression with examples.
Think about whether the original file can be perfectly restored.
You got /3 concepts.
Describe why data compression is useful in everyday computer use.
Consider what happens when you send or save large files.
You got /3 concepts.