lossy compression

any compression (4.31) algorithm which loses some of the original information during compression so that the decompressed data is only an approximation of the original
This is especially useful in image compression (4.69), where details that are not perceptible, or are minimally perceptible, to the human eye can be eliminated, normally with a dramatic increase in compression (4.31).
(SOURCE: JIS Z 6015:2022, 4.88)