This topic covers the units used to measure data, from bits and bytes up to terabytes, and how to calculate the storage a file requires. It then looks at compression and why it matters for storage space and transmission time. Lossy and lossless compression are compared: how each one reduces file size, what is lost, and which is appropriate for text, images, audio and video. Run-length encoding is examined as a worked example of lossless compression.
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