Apps that access your local network can collect information about nearby devices in order to determine which networks you join and when. This information could be used to create a profile of you. With iOS 14 and iPadOS 14, any app that wants to interact with devices on your network must ask for permission the first time it tries to browse your local network.
The app developer can customize the message to explain why the app would like access. For example, a game might want to find and connect to other players on the same network. Or a streaming app may be looking for a connected display.
Tap OK to grant the app access to your local network. If you don’t want to allow access, or if it’s not clear to you why the app needs access, you can tap Don’t Allow. The app can still use the internet or interact with the local network using a system service, like AirPrint, AirPlay, AirDrop, or HomeKit.
At any time, you can change your mind and allow or revoke an app's access to the local network. In Settings, go to Privacy > Local Network to see a list of every app that requested access.
If you're concerned about why an app wants access to your local network or how access is used, you can also contact the app developer for more information.