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These lossy data compression schemes discard some data to simplify the media sufficiently to store it in the desired space (data-rate) – if there is not enough data in the compressed version to reproduce the original with acceptable fidelity, artifacts will result. — “Compression artifact - Wikipedia, the free encyclopedia”, en.wikipedia.org
An artifact or artefact is any object made or modified by a human. In archaeology, where the term is most commonly used, an artifact is an object recovered by some archaeological endeavor, which may have a cultural interest. — “Artifact (archaeology) - Wikipedia, the free encyclopedia”, en.wikipedia.org
Artifact (software development), one of many kinds of tangible byproducts produced during the development of software. Compression artifact, when the data compression of an image, audio, or video is too complex, resulting in a loss of clarity. — “Artifact - Wikipedia, the free encyclopedia”, en.wikipedia.org