MicroSD cards are small, portable storage devices used to expand the memory of various electronic devices, such as smartphones, tablets, and cameras. They come in different storage capacities, ranging from a few gigabytes to several terabytes, allowing users to store photos, videos, music, and other files easily. These cards are designed to be inserted into a compatible slot in a device. MicroSD cards are popular due to their compact size and versatility, making them an essential accessory for anyone needing extra storage on their devices. They are also commonly used in drones and gaming consoles.