CD writers and DVD writers are storage devices. You write (save) data onto disks with them and store these for later use. They can be input devices too because software often comes ready to install on your computer from a CD-ROM or DVD. You can save files, music, videos, games, almost anything — as long as there is enough space on the CD or DVD.
Memory sticks are a quick and easy way to save files. Also known as ‘flash memory’, they come in various sizes and prices and generally attach to your computer through a connection known as a universal serial bus (USB) port.
Sometimes your computer might even have a USB hub (a box with lots of ports on it) to connect several USB devices. These can be both input and output devices.