SD Cards, or Secure Digital cards, are small, portable storage devices used to save and transfer data. They are commonly found in devices like cameras, smartphones, and tablets, allowing users to store photos, videos, and music. With various storage capacities, SD cards can hold a significant amount of information, making them essential for anyone who needs extra space. There are different types of SD Cards, including SDHC (Secure Digital High Capacity) and SDXC (Secure Digital eXtended Capacity), which offer varying storage limits. These cards are easy to use; simply insert them into a compatible device, and you can start saving your important files right away.