Which of the following best describes lossy compression?

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Multiple Choice

Which of the following best describes lossy compression?

Lossy compression reduces the size of data by discarding some information, so when you reconstruct it later you don’t get the exact original file—the lost data cannot be recovered. This irreversible information loss is the defining characteristic of lossy methods, which is why the description that mentions permanent loss of information upon reconstruction is the best match. In practical terms, this approach is used in media like images, audio, and video to save space, accepting small quality changes. By contrast, describing data as preserved in full points to lossless compression, which allows exact restoration; describing data reduction without any loss also implies lossless behavior; and encrypting data is a security procedure, not a compression method.

Lossy compression reduces the size of data by discarding some information, so when you reconstruct it later you don’t get the exact original file—the lost data cannot be recovered. This irreversible information loss is the defining characteristic of lossy methods, which is why the description that mentions permanent loss of information upon reconstruction is the best match. In practical terms, this approach is used in media like images, audio, and video to save space, accepting small quality changes. By contrast, describing data as preserved in full points to lossless compression, which allows exact restoration; describing data reduction without any loss also implies lossless behavior; and encrypting data is a security procedure, not a compression method.

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