SD Card

An SD card (Secure Digital) is a small portable memory card that can be used to store digital data, such as photos, videos, music, and documents.

SD cards can be used in certain hi-fi systems to store and play music. Hi-fi systems that support SD cards can often play audio files stored on these cards, including MP3, WAV, and FLAC files. This allows users to store and play their digital music collection on their hi-fi system without having to use a computer or another external storage device.