Using a card reader
This guide is about using a card reader to copy media from your camera to a computer.
The most common memory cards used are the SD Card types. They come in 3 physical sizes and many different capacities. Only 2 of the sizes are in common use. They are the full (postage stamp) size and the micro SD card size typically used by mobile devices. This https://en.wikipedia.org/wiki/SD_card Wikipedia article describes them in more detail. Most micro SD cards come with an adapter to work in a devices that take the full size cards.