gen-briefly-explain-lossless-versus-lossy-compression-and-one-co-da20

Briefly explain lossless versus lossy compression and one common misconception about it.

# Lossless vs Lossy Compression **Lossless compression** reduces file size while preserving all original data perfectly. When decompressed, you get an exact copy of the original. Examples: ZIP, PNG, FLAC. **Lossy compression** achieves much smaller files by permanently discarding some data that's deemed less important. The decompressed file is similar but not identical to the original. Examples: JPEG, MP3, MP4. ## Common Misconception **"Saving a lossy file multiple times keeps degrading it"** While technically true if you *re-encode* a file repeatedly (like opening a JPEG, editing it, and saving it again), simply opening and closing a lossy file without re-saving doesn't cause degradation. The damage only occurs when the compression algorithm is reapplied. This is why video editors work with high-quality intermediates and only apply heavy lossy compression to the final export.