The "Secure Digital 카드" (SD 카드) is a type of memory card used for storing data in various electronic devices. It is commonly found in devices like cameras, smartphones, and tablets. SD cards come in different storage capacities, allowing users to save photos, videos, and other files easily. These cards are designed to be portable and durable, making them ideal for everyday use. They use flash memory technology, which enables quick data access and transfer. Additionally, SD cards can be classified into different types, such as SDHC and SDXC, based on their storage capacity and speed.