An SD कार्ड (Secure Digital card) is a small, portable storage device used to store data in various electronic devices. It is commonly found in cameras, smartphones, tablets, and laptops, allowing users to save photos, videos, music, and other files. SD cards come in different sizes and storage capacities, ranging from a few megabytes to several terabytes. These cards are designed for easy use and portability. They can be inserted and removed from devices without needing special tools. Many devices support different types of SD cards, including microSD and SDHC, making them versatile for various applications.