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Intro to Computingfundamentals~5 mins

Data compression basics in Intro to Computing - Cheat Sheet & Quick Revision

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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?
AMake files smaller
BMake files larger
CChange file format
DDelete files
Which type of compression removes some data permanently?
ALossless
BNone
CBoth
DLossy
Which file format uses lossless compression?
AMP3
BPNG
CJPEG
DMP4
What is a real-world analogy for data compression?
AThrowing clothes away
BBuying a bigger suitcase
CFilling a suitcase tightly
DWashing clothes
Why is data compression important for internet use?
AIt reduces data usage and speeds up transfer
BIt uses more data
CIt slows down downloads
DIt changes file colors
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.