1, the abbreviation of HQ: high quality, which means "high quality".

2. SQ: the abbreviation of super quality, which means "super high quality".

3.sq takes up more storage space than hq music files, but the sound quality is better. SQ Music is the first super-quality music promoted by Tencent QQ Company. SQ for short, adopts APE and FLAC lossless formats, and 100% saves all sound details, so that users can experience the sound quality of the original CD.