A microSD is a small, removable memory card used to store data in devices like smartphones, tablets, and cameras. It is a popular choice for expanding storage capacity, allowing users to save photos, videos, and apps without using the device's internal memory. These cards come in various storage sizes, ranging from a few gigabytes to several terabytes. They are designed to be compact and lightweight, making them easy to carry and swap between devices. The microSD card is part of the SD card family, which includes standard and mini versions, but is specifically designed for smaller electronics.