SACD, which stands for Super Audio Compact Disc, is a high-quality audio format that was introduced in the early 2000s. There are several synonyms for SACD, including Hi-Res Audio, Direct Stream Digital (DSD), and Blu-ray Audio. Hi-Res Audio, like SACD, also delivers higher quality audio than standard CDs. Direct Stream Digital refers to the digital audio technology used in SACDs, while Blu-ray Audio refers to the high-resolution audio format that is often included on Blu-ray discs. Other synonyms for SACD include Super Audio and DSD Audio. Regardless of the term used, fans of high-end audio will appreciate the superior sound quality offered by this format.