A smart refrigerator is a refrigerator that has Internet access and is able to recognize and manage items stored inside it. Automatic detection requires a barcode or RIFD on each item, or items can also be registered manually. A smart refrigerator allows a user to know which items are inside the refrigerator without opening it, by simply checking the display list on an LCD or other output device. The refrigerator is able to send its content list to various other display devices and is able to communicate via various mediums. This technology evolved in early 2000s.