If setting up a guest network is “beneath” you for a home’s wireless network, Apple has devised a different way to provide internet access to friends or family. iOS 11 includes a new Wi-Fi password sharing feature that makes logging on to a new network relatively simple.

For starters, you’ll need to have at least one device with iOS 11

Source: Hot Hardware – Apple Simplifies iOS 11 Wi-Fi Sharing By Auto Sending Passwords To Nearby Friends