A MicroSD card is a small, portable storage device used to expand the memory of various electronic devices, such as smartphones, tablets, and cameras. It allows users to store photos, videos, music, and other files, making it easier to manage data without relying solely on the device's internal storage. MicroSD cards come in different storage capacities, ranging from a few gigabytes (GB) to several terabytes (TB). They are designed to be easily inserted and removed from compatible devices, providing a convenient way to transfer data between devices or back up important files.