Compression

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What is the main goal of file compression?: Reducing file size
What primary benefit does compression provide for networks?: Reduce transmission time and bandwidth
Why is compression essential for streaming media?: Allow download faster than playback
If a 1-minute audio file is compressed from 10 MB to 1 MB, how does download time change at 8 Mbps?: About one second to download
Why is uncompressed 4K video impractical for many uses?: Requires terabytes of storage and bandwidth
What does a 4:1 compression ratio indicate?: Uncompressed size four times compressed size
Which are the two main compression categories?: Lossy and lossless compression methods
Why must text files be compressed losslessly?: Because original text must be perfectly preserved
Which file types can use either lossy or lossless compression?: Images, audio, and video files
What best describes lossy compression?: Permanently removes data for smaller size
Which compression type is required for plain text files to preserve exact data?: Lossless compression to preserve exact data
Which two techniques do lossy codecs commonly use to discard data while preserving perceived quality?: Remove inaudible frequencies and simplify details
Which statement describes files that require lossless compression to avoid harmful changes?: Source code and legal documents need lossless
Which best describes compression ratio and quality trade-offs between lossy and lossless formats?: Lossy gives higher ratios but lower fidelity
Which consequence follows from lossy compression permanently removing data?: Removed data cannot be recovered later

Compression

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