Dash is a small handheld device that connects to your home WiFi network and can both scan barcodes on the products in your house and also receive voice commands from the user. When you run out of, say, milk, you can scan the barcode on the empty carton. Milk will show up on your AmazonFresh list, and you can check out using your PC or a mobile app.
By the next day, the milk will be delivered to your front door, along with any other groceries you purchased.
Perhaps we should back up a bit: AmazonFresh is a grocery delivery service that is currently only available in Seattle, Southern California, and San Francisco, so the vast majority of the country doesn’t get to experience the awe of ordering all your groceries (including booze) online and having them delivered right to your door by a person in an Amazon uniform.
Even for those lucky enough to enjoy the service, Dash is an invitation-only deal at the moment. Hopefully both AmazonFresh and Amazon Dash will spread to other areas of the country posthaste.