An SD card (Secure Digital Card) is a widely used storage medium for digital cameras and other electronic devices. The SD card is a compact, lightweight, and removable storage medium used to store photos, videos, and other files. There are various sizes of SD cards, such as standard SD, mini SD, and micro SD, as well as different speed classes and capacities. Photographers use SD cards to store their images and videos and easily transfer them from the camera to a computer or another device.