SD card is an acronym for Secure Digital Card. SD card is a storage device that uses non-volatile memory. That means that when power is lost to the card the data doesn't get lost. SD cards are common is portable cameras, and camcorders. There popularity has led to built in SD card readers to be common on computers, laptops, and tablets. There are three different capacity ranges, SDSC 1MB to 2GB, SDHC 2GB to 32GB, and SDXC 32GB to 2TB. Some older devices may only be compatible with the smaller capacity versions.
