Alternatively referred to as a media card reader, a card reader is a hardware device that lets you read and write data on a memory card such as a multimedia card. Some card readers only have one card slot, and some have multiple card slots for different cards and media. In the picture below, you can see an example of a USB media card reader from Kingston. This card reader has a slot for miniSD, MicroSD, SD/MMC, MMCmicro, CF/MD, M2, and MS/DUO cards. Media card readers mostly find use for those who want to download information from expanded storage on a smartphone, or memory from a digital camera.
Devices with built-in readers
Memory card readers are also built into some printers, laptops, and can be put in a 5 1/4" or 3 1/2" drive bay in desktop computers. The picture to the right shows a 3 1/2" drive bay media card reader for a desktop computer.