Final answer:
The feature that simplifies file transfer between Apple devices by establishing a Wi-Fi Direct connection is called AirDrop.
Step-by-step explanation:
The feature included with both macOS and Apple iOS to establish a Wi-Fi Direct connection between devices to simplify file transfer is AirDrop. AirDrop allows users to share files directly between Apple devices without the need for an internet connection, making use of a combination of Wi-Fi and Bluetooth. It's known for its ease of use and speed in transferring photos, videos, documents, and more between nearby Apple devices.