The best models can discern between people and pets and recognize the presence of a package left at your door.
Some models—from Ring, Arlo, Netatmo, and Maximus—incorporate lights that can illuminate your way. Cameras incorporated into doorbells can monitor your porch and let you interact with visitors without needing to approach the door—or even be home at the time. The best models can discern between people and pets and recognize the presence of a package left at your door.