Solid-state storage devices are based on electronic circuits with no moving parts (no reels of tape, no spinning discs, no laser beams, etc.)
Solid-state storage devices store data using a special type of memory called flash memory...
Flash memory can be found in many data storage devices...
USB Memory Sticks
Memory sticks are non-volatile, random-access storage devices.
Each of these small devices has some flash memory connected to a USB interface. Plug it into your computer and it appears as a drive. You can then add files, erase files, etc. You can use it to move any type of file between computers.
Flash memory used to be very expensive, but in recent years it has become much cheaper and you can now buy a 16GB memory stick for just a few dollars.
One of the most common formats used by digital cameras is the SD Card. The cards store the digital images taken by the camera.
Many phones also have extra memory cards to store music, video, photos, etc. (e.g Tiny Micro-SD cards).
Cards with flash memory are called smart cards.