What is sd card on 3ds?

The SD card on a Nintendo 3DS is a type of memory card used to store various types of data, including game saves, system updates, and digital downloads. The 3DS comes with a 4GB SD card, but it can support up to 32GB cards. The SD card is located behind a cover on the left side of the console and can be easily swapped out. It is also used to transfer data between 3DS systems and as a backup for saved data. Some games and applications can be downloaded onto the SD card, freeing up internal storage space on the console. However, the SD card cannot be used to store Nintendo Switch games.