A smart fridge often uses RFID or barcodes to scan what is inside the fridge to determine when an item needs to be replenished. Alternatively, some brands use voice recognition to understand spoken inventory as you unpack your groceries. They are typically connected to the interent using your home internet.
Facts about smart fridges.
"The smart fridge isn’t smart because it opens up new doors and provides you with new experiences. It’s smart because it takes care of things you’d rather not dedicate brain power to in the first place."