Amazon Key uses the company’s new Cloud Cam security camera, a smart door lock and the new Key app to grant someone temporary access. A delivery person can unlock your front door using his phone, slide in a package, then lock the door again. The idea is to prevent packages from being stolen from the front stoop or have them get soaked in the rain.

https://www.cnet.com/news/amazon-key-launch-privacy-home-deliveries-cloud-cam/?ftag=CAD-03-10aaj8j